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third_party/polymer/components/webcomponentsjs/CustomElements.js

 /**
  * @license
  * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
  * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
  * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
  * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
-// @version 0.7.22
+// @version 0.6.1
 if (typeof WeakMap === "undefined") {
   (function() {
     var defineProperty = Object.defineProperty;
     var counter = Date.now() % 1e9;
     var WeakMap = function() {
       this.name = "__st" + (Math.random() * 1e9 >>> 0) + (counter++ + "__");
     };
     WeakMap.prototype = {
       set: function(key, value) {
         var entry = key[this.name];
@@ skipping 17 matching lines @@
         var entry = key[this.name];
         if (!entry) return false;
         return entry[0] === key;
       }
     };
     window.WeakMap = WeakMap;
   })();
 }
 
 (function(global) {
-  if (global.JsMutationObserver) {
-    return;
-  }
   var registrationsTable = new WeakMap();
   var setImmediate;
   if (/Trident|Edge/.test(navigator.userAgent)) {
     setImmediate = setTimeout;
   } else if (window.setImmediate) {
     setImmediate = window.setImmediate;
   } else {
     var setImmediateQueue = [];
     var sentinel = String(Math.random());
     window.addEventListener("message", function(e) {
@@ skipping 275 matching lines @@
         record.nextSibling = nextSibling;
         forEachAncestorAndObserverEnqueueRecord(e.relatedNode, function(options) {
           if (!options.childList) return;
           return record;
         });
       }
       clearRecords();
     }
   };
   global.JsMutationObserver = JsMutationObserver;
-  if (!global.MutationObserver) {
-    global.MutationObserver = JsMutationObserver;
-    JsMutationObserver._isPolyfilled = true;
-  }
-})(self);
-
-(function(scope) {
-  "use strict";
-  if (!window.performance) {
-    var start = Date.now();
-    window.performance = {
-      now: function() {
-        return Date.now() - start;
-      }
-    };
-  }
-  if (!window.requestAnimationFrame) {
-    window.requestAnimationFrame = function() {
-      var nativeRaf = window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
-      return nativeRaf ? function(callback) {
-        return nativeRaf(function() {
-          callback(performance.now());
-        });
-      } : function(callback) {
-        return window.setTimeout(callback, 1e3 / 60);
-      };
-    }();
-  }
-  if (!window.cancelAnimationFrame) {
-    window.cancelAnimationFrame = function() {
-      return window.webkitCancelAnimationFrame || window.mozCancelAnimationFrame || function(id) {
-        clearTimeout(id);
-      };
-    }();
-  }
-  var workingDefaultPrevented = function() {
-    var e = document.createEvent("Event");
-    e.initEvent("foo", true, true);
-    e.preventDefault();
-    return e.defaultPrevented;
-  }();
-  if (!workingDefaultPrevented) {
-    var origPreventDefault = Event.prototype.preventDefault;
-    Event.prototype.preventDefault = function() {
-      if (!this.cancelable) {
-        return;
-      }
-      origPreventDefault.call(this);
-      Object.defineProperty(this, "defaultPrevented", {
-        get: function() {
-          return true;
-        },
-        configurable: true
-      });
-    };
-  }
-  var isIE = /Trident/.test(navigator.userAgent);
-  if (!window.CustomEvent || isIE && typeof window.CustomEvent !== "function") {
-    window.CustomEvent = function(inType, params) {
-      params = params || {};
-      var e = document.createEvent("CustomEvent");
-      e.initCustomEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable), params.detail);
-      return e;
-    };
-    window.CustomEvent.prototype = window.Event.prototype;
-  }
-  if (!window.Event || isIE && typeof window.Event !== "function") {
-    var origEvent = window.Event;
-    window.Event = function(inType, params) {
-      params = params || {};
-      var e = document.createEvent("Event");
-      e.initEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable));
-      return e;
-    };
-    window.Event.prototype = origEvent.prototype;
-  }
-})(window.WebComponents);
+  if (!global.MutationObserver) global.MutationObserver = JsMutationObserver;
+})(this);
 
 window.CustomElements = window.CustomElements || {
   flags: {}
 };
 
 (function(scope) {
   var flags = scope.flags;
   var modules = [];
   var addModule = function(module) {
     modules.push(module);
   };
   var initializeModules = function() {
     modules.forEach(function(module) {
       module(scope);
     });
   };
   scope.addModule = addModule;
   scope.initializeModules = initializeModules;
   scope.hasNative = Boolean(document.registerElement);
-  scope.isIE = /Trident/.test(navigator.userAgent);
-  scope.useNative = !flags.register && scope.hasNative && !window.ShadowDOMPolyfill && (!window.HTMLImports || window.HTMLImports.useNative);
-})(window.CustomElements);
+  scope.useNative = !flags.register && scope.hasNative && !window.ShadowDOMPolyfill && (!window.HTMLImports || HTMLImports.useNative);
+})(CustomElements);
 
-window.CustomElements.addModule(function(scope) {
-  var IMPORT_LINK_TYPE = window.HTMLImports ? window.HTMLImports.IMPORT_LINK_TYPE : "none";
+CustomElements.addModule(function(scope) {
+  var IMPORT_LINK_TYPE = window.HTMLImports ? HTMLImports.IMPORT_LINK_TYPE : "none";
   function forSubtree(node, cb) {
     findAllElements(node, function(e) {
       if (cb(e)) {
         return true;
       }
       forRoots(e, cb);
     });
     forRoots(node, cb);
   }
   function findAllElements(node, find, data) {
@@ skipping 16 matching lines @@
     var root = node.shadowRoot;
     while (root) {
       forSubtree(root, cb);
       root = root.olderShadowRoot;
     }
   }
   function forDocumentTree(doc, cb) {
     _forDocumentTree(doc, cb, []);
   }
   function _forDocumentTree(doc, cb, processingDocuments) {
-    doc = window.wrap(doc);
+    doc = wrap(doc);
     if (processingDocuments.indexOf(doc) >= 0) {
       return;
     }
     processingDocuments.push(doc);
     var imports = doc.querySelectorAll("link[rel=" + IMPORT_LINK_TYPE + "]");
     for (var i = 0, l = imports.length, n; i < l && (n = imports[i]); i++) {
       if (n.import) {
         _forDocumentTree(n.import, cb, processingDocuments);
       }
     }
     cb(doc);
   }
   scope.forDocumentTree = forDocumentTree;
   scope.forSubtree = forSubtree;
 });
 
-window.CustomElements.addModule(function(scope) {
+CustomElements.addModule(function(scope) {
   var flags = scope.flags;
   var forSubtree = scope.forSubtree;
   var forDocumentTree = scope.forDocumentTree;
-  function addedNode(node, isAttached) {
-    return added(node, isAttached) || addedSubtree(node, isAttached);
+  function addedNode(node) {
+    return added(node) || addedSubtree(node);
   }
-  function added(node, isAttached) {
-    if (scope.upgrade(node, isAttached)) {
+  function added(node) {
+    if (scope.upgrade(node)) {
       return true;
     }
-    if (isAttached) {
-      attached(node);
-    }
+    attached(node);
   }
-  function addedSubtree(node, isAttached) {
+  function addedSubtree(node) {
     forSubtree(node, function(e) {
-      if (added(e, isAttached)) {
+      if (added(e)) {
         return true;
       }
     });
   }
-  var hasThrottledAttached = window.MutationObserver._isPolyfilled && flags["throttle-attached"];
-  scope.hasPolyfillMutations = hasThrottledAttached;
-  scope.hasThrottledAttached = hasThrottledAttached;
+  function attachedNode(node) {
+    attached(node);
+    if (inDocument(node)) {
+      forSubtree(node, function(e) {
+        attached(e);
+      });
+    }
+  }
+  var hasPolyfillMutations = !window.MutationObserver || window.MutationObserver === window.JsMutationObserver;
+  scope.hasPolyfillMutations = hasPolyfillMutations;
   var isPendingMutations = false;
   var pendingMutations = [];
   function deferMutation(fn) {
     pendingMutations.push(fn);
     if (!isPendingMutations) {
       isPendingMutations = true;
       setTimeout(takeMutations);
     }
   }
   function takeMutations() {
     isPendingMutations = false;
     var $p = pendingMutations;
     for (var i = 0, l = $p.length, p; i < l && (p = $p[i]); i++) {
       p();
     }
     pendingMutations = [];
   }
   function attached(element) {
-    if (hasThrottledAttached) {
+    if (hasPolyfillMutations) {
       deferMutation(function() {
         _attached(element);
       });
     } else {
       _attached(element);
     }
   }
   function _attached(element) {
-    if (element.__upgraded__ && !element.__attached) {
-      element.__attached = true;
-      if (element.attachedCallback) {
-        element.attachedCallback();
+    if (element.__upgraded__ && (element.attachedCallback || element.detachedCallback)) {
+      if (!element.__attached && inDocument(element)) {
+        element.__attached = true;
+        if (element.attachedCallback) {
+          element.attachedCallback();
+        }
       }
     }
   }
   function detachedNode(node) {
     detached(node);
     forSubtree(node, function(e) {
       detached(e);
     });
   }
   function detached(element) {
-    if (hasThrottledAttached) {
+    if (hasPolyfillMutations) {
       deferMutation(function() {
         _detached(element);
       });
     } else {
       _detached(element);
     }
   }
   function _detached(element) {
-    if (element.__upgraded__ && element.__attached) {
-      element.__attached = false;
-      if (element.detachedCallback) {
-        element.detachedCallback();
+    if (element.__upgraded__ && (element.attachedCallback || element.detachedCallback)) {
+      if (element.__attached && !inDocument(element)) {
+        element.__attached = false;
+        if (element.detachedCallback) {
+          element.detachedCallback();
+        }
       }
     }
   }
   function inDocument(element) {
     var p = element;
-    var doc = window.wrap(document);
+    var doc = wrap(document);
     while (p) {
       if (p == doc) {
         return true;
       }
       p = p.parentNode || p.nodeType === Node.DOCUMENT_FRAGMENT_NODE && p.host;
     }
   }
   function watchShadow(node) {
     if (node.shadowRoot && !node.shadowRoot.__watched) {
       flags.dom && console.log("watching shadow-root for: ", node.localName);
       var root = node.shadowRoot;
       while (root) {
         observe(root);
         root = root.olderShadowRoot;
       }
     }
   }
-  function handler(root, mutations) {
+  function handler(mutations) {
     if (flags.dom) {
       var mx = mutations[0];
       if (mx && mx.type === "childList" && mx.addedNodes) {
         if (mx.addedNodes) {
           var d = mx.addedNodes[0];
           while (d && d !== document && !d.host) {
             d = d.parentNode;
           }
           var u = d && (d.URL || d._URL || d.host && d.host.localName) || "";
           u = u.split("/?").shift().split("/").pop();
         }
       }
       console.group("mutations (%d) [%s]", mutations.length, u || "");
     }
-    var isAttached = inDocument(root);
     mutations.forEach(function(mx) {
       if (mx.type === "childList") {
         forEach(mx.addedNodes, function(n) {
           if (!n.localName) {
             return;
           }
-          addedNode(n, isAttached);
+          addedNode(n);
         });
         forEach(mx.removedNodes, function(n) {
           if (!n.localName) {
             return;
           }
           detachedNode(n);
         });
       }
     });
     flags.dom && console.groupEnd();
   }
   function takeRecords(node) {
-    node = window.wrap(node);
+    node = wrap(node);
     if (!node) {
-      node = window.wrap(document);
+      node = wrap(document);
     }
     while (node.parentNode) {
       node = node.parentNode;
     }
     var observer = node.__observer;
     if (observer) {
-      handler(node, observer.takeRecords());
+      handler(observer.takeRecords());
       takeMutations();
     }
   }
   var forEach = Array.prototype.forEach.call.bind(Array.prototype.forEach);
   function observe(inRoot) {
     if (inRoot.__observer) {
       return;
     }
-    var observer = new MutationObserver(handler.bind(this, inRoot));
+    var observer = new MutationObserver(handler);
     observer.observe(inRoot, {
       childList: true,
       subtree: true
     });
     inRoot.__observer = observer;
   }
   function upgradeDocument(doc) {
-    doc = window.wrap(doc);
+    doc = wrap(doc);
     flags.dom && console.group("upgradeDocument: ", doc.baseURI.split("/").pop());
-    var isMainDocument = doc === window.wrap(document);
-    addedNode(doc, isMainDocument);
+    addedNode(doc);
     observe(doc);
     flags.dom && console.groupEnd();
   }
   function upgradeDocumentTree(doc) {
     forDocumentTree(doc, upgradeDocument);
   }
   var originalCreateShadowRoot = Element.prototype.createShadowRoot;
   if (originalCreateShadowRoot) {
     Element.prototype.createShadowRoot = function() {
       var root = originalCreateShadowRoot.call(this);
-      window.CustomElements.watchShadow(this);
+      CustomElements.watchShadow(this);
       return root;
     };
   }
   scope.watchShadow = watchShadow;
   scope.upgradeDocumentTree = upgradeDocumentTree;
-  scope.upgradeDocument = upgradeDocument;
   scope.upgradeSubtree = addedSubtree;
   scope.upgradeAll = addedNode;
-  scope.attached = attached;
+  scope.attachedNode = attachedNode;
   scope.takeRecords = takeRecords;
 });
 
-window.CustomElements.addModule(function(scope) {
+CustomElements.addModule(function(scope) {
   var flags = scope.flags;
-  function upgrade(node, isAttached) {
-    if (node.localName === "template") {
-      if (window.HTMLTemplateElement && HTMLTemplateElement.decorate) {
-        HTMLTemplateElement.decorate(node);
-      }
-    }
+  function upgrade(node) {
     if (!node.__upgraded__ && node.nodeType === Node.ELEMENT_NODE) {
       var is = node.getAttribute("is");
-      var definition = scope.getRegisteredDefinition(node.localName) || scope.getRegisteredDefinition(is);
+      var definition = scope.getRegisteredDefinition(is || node.localName);
       if (definition) {
-        if (is && definition.tag == node.localName || !is && !definition.extends) {
-          return upgradeWithDefinition(node, definition, isAttached);
+        if (is && definition.tag == node.localName) {
+          return upgradeWithDefinition(node, definition);
+        } else if (!is && !definition.extends) {
+          return upgradeWithDefinition(node, definition);
         }
       }
     }
   }
-  function upgradeWithDefinition(element, definition, isAttached) {
+  function upgradeWithDefinition(element, definition) {
     flags.upgrade && console.group("upgrade:", element.localName);
     if (definition.is) {
       element.setAttribute("is", definition.is);
     }
     implementPrototype(element, definition);
     element.__upgraded__ = true;
     created(element);
-    if (isAttached) {
-      scope.attached(element);
-    }
-    scope.upgradeSubtree(element, isAttached);
+    scope.attachedNode(element);
+    scope.upgradeSubtree(element);
     flags.upgrade && console.groupEnd();
     return element;
   }
   function implementPrototype(element, definition) {
     if (Object.__proto__) {
       element.__proto__ = definition.prototype;
     } else {
       customMixin(element, definition.prototype, definition.native);
       element.__proto__ = definition.prototype;
     }
@@ skipping 15 matching lines @@
   function created(element) {
     if (element.createdCallback) {
       element.createdCallback();
     }
   }
   scope.upgrade = upgrade;
   scope.upgradeWithDefinition = upgradeWithDefinition;
   scope.implementPrototype = implementPrototype;
 });
 
-window.CustomElements.addModule(function(scope) {
-  var isIE = scope.isIE;
+CustomElements.addModule(function(scope) {
+  var isIE11OrOlder = scope.isIE11OrOlder;
   var upgradeDocumentTree = scope.upgradeDocumentTree;
   var upgradeAll = scope.upgradeAll;
   var upgradeWithDefinition = scope.upgradeWithDefinition;
   var implementPrototype = scope.implementPrototype;
   var useNative = scope.useNative;
   function register(name, options) {
     var definition = options || {};
     if (!name) {
       throw new Error("document.registerElement: first argument `name` must not be empty");
     }
     if (name.indexOf("-") < 0) {
       throw new Error("document.registerElement: first argument ('name') must contain a dash ('-'). Argument provided was '" + String(name) + "'.");
     }
     if (isReservedTag(name)) {
       throw new Error("Failed to execute 'registerElement' on 'Document': Registration failed for type '" + String(name) + "'. The type name is invalid.");
     }
     if (getRegisteredDefinition(name)) {
       throw new Error("DuplicateDefinitionError: a type with name '" + String(name) + "' is already registered");
     }
     if (!definition.prototype) {
       definition.prototype = Object.create(HTMLElement.prototype);
     }
     definition.__name = name.toLowerCase();
-    if (definition.extends) {
-      definition.extends = definition.extends.toLowerCase();
-    }
     definition.lifecycle = definition.lifecycle || {};
     definition.ancestry = ancestry(definition.extends);
     resolveTagName(definition);
     resolvePrototypeChain(definition);
     overrideAttributeApi(definition.prototype);
     registerDefinition(definition.__name, definition);
     definition.ctor = generateConstructor(definition);
     definition.ctor.prototype = definition.prototype;
     definition.prototype.constructor = definition.ctor;
     if (scope.ready) {
@@ skipping 47 matching lines @@
     definition.tag = baseTag || definition.__name;
     if (baseTag) {
       definition.is = definition.__name;
     }
   }
   function resolvePrototypeChain(definition) {
     if (!Object.__proto__) {
       var nativePrototype = HTMLElement.prototype;
       if (definition.is) {
         var inst = document.createElement(definition.tag);
-        nativePrototype = Object.getPrototypeOf(inst);
+        var expectedPrototype = Object.getPrototypeOf(inst);
+        if (expectedPrototype === definition.prototype) {
+          nativePrototype = expectedPrototype;
+        }
       }
       var proto = definition.prototype, ancestor;
-      var foundPrototype = false;
-      while (proto) {
-        if (proto == nativePrototype) {
-          foundPrototype = true;
-        }
+      while (proto && proto !== nativePrototype) {
         ancestor = Object.getPrototypeOf(proto);
-        if (ancestor) {
-          proto.__proto__ = ancestor;
-        }
+        proto.__proto__ = ancestor;
         proto = ancestor;
       }
-      if (!foundPrototype) {
-        console.warn(definition.tag + " prototype not found in prototype chain for " + definition.is);
-      }
       definition.native = nativePrototype;
     }
   }
   function instantiate(definition) {
     return upgradeWithDefinition(domCreateElement(definition.tag), definition);
   }
   var registry = {};
   function getRegisteredDefinition(name) {
     if (name) {
       return registry[name.toLowerCase()];
     }
   }
   function registerDefinition(name, definition) {
     registry[name] = definition;
   }
   function generateConstructor(definition) {
     return function() {
       return instantiate(definition);
     };
   }
   var HTML_NAMESPACE = "http://www.w3.org/1999/xhtml";
   function createElementNS(namespace, tag, typeExtension) {
     if (namespace === HTML_NAMESPACE) {
       return createElement(tag, typeExtension);
     } else {
       return domCreateElementNS(namespace, tag);
     }
   }
   function createElement(tag, typeExtension) {
-    if (tag) {
-      tag = tag.toLowerCase();
-    }
-    if (typeExtension) {
-      typeExtension = typeExtension.toLowerCase();
-    }
     var definition = getRegisteredDefinition(typeExtension || tag);
     if (definition) {
       if (tag == definition.tag && typeExtension == definition.is) {
         return new definition.ctor();
       }
       if (!typeExtension && !definition.is) {
         return new definition.ctor();
       }
     }
     var element;
     if (typeExtension) {
       element = createElement(tag);
       element.setAttribute("is", typeExtension);
       return element;
     }
     element = domCreateElement(tag);
     if (tag.indexOf("-") >= 0) {
       implementPrototype(element, HTMLElement);
     }
     return element;
   }
   var domCreateElement = document.createElement.bind(document);
   var domCreateElementNS = document.createElementNS.bind(document);
   var isInstance;
   if (!Object.__proto__ && !useNative) {
     isInstance = function(obj, ctor) {
-      if (obj instanceof ctor) {
-        return true;
-      }
       var p = obj;
       while (p) {
         if (p === ctor.prototype) {
           return true;
         }
         p = p.__proto__;
       }
       return false;
     };
   } else {
     isInstance = function(obj, base) {
       return obj instanceof base;
     };
   }
   function wrapDomMethodToForceUpgrade(obj, methodName) {
     var orig = obj[methodName];
     obj[methodName] = function() {
       var n = orig.apply(this, arguments);
       upgradeAll(n);
       return n;
     };
   }
   wrapDomMethodToForceUpgrade(Node.prototype, "cloneNode");
   wrapDomMethodToForceUpgrade(document, "importNode");
+  if (isIE11OrOlder) {
+    (function() {
+      var importNode = document.importNode;
+      document.importNode = function() {
+        var n = importNode.apply(document, arguments);
+        if (n.nodeType == n.DOCUMENT_FRAGMENT_NODE) {
+          var f = document.createDocumentFragment();
+          f.appendChild(n);
+          return f;
+        } else {
+          return n;
+        }
+      };
+    })();
+  }
   document.registerElement = register;
   document.createElement = createElement;
   document.createElementNS = createElementNS;
   scope.registry = registry;
   scope.instanceof = isInstance;
   scope.reservedTagList = reservedTagList;
   scope.getRegisteredDefinition = getRegisteredDefinition;
   document.register = document.registerElement;
 });
 
 (function(scope) {
   var useNative = scope.useNative;
   var initializeModules = scope.initializeModules;
-  var isIE = scope.isIE;
+  var isIE11OrOlder = /Trident/.test(navigator.userAgent);
   if (useNative) {
     var nop = function() {};
     scope.watchShadow = nop;
     scope.upgrade = nop;
     scope.upgradeAll = nop;
     scope.upgradeDocumentTree = nop;
     scope.upgradeSubtree = nop;
     scope.takeRecords = nop;
     scope.instanceof = function(obj, base) {
       return obj instanceof base;
     };
   } else {
     initializeModules();
   }
   var upgradeDocumentTree = scope.upgradeDocumentTree;
-  var upgradeDocument = scope.upgradeDocument;
   if (!window.wrap) {
     if (window.ShadowDOMPolyfill) {
-      window.wrap = window.ShadowDOMPolyfill.wrapIfNeeded;
-      window.unwrap = window.ShadowDOMPolyfill.unwrapIfNeeded;
+      window.wrap = ShadowDOMPolyfill.wrapIfNeeded;
+      window.unwrap = ShadowDOMPolyfill.unwrapIfNeeded;
     } else {
       window.wrap = window.unwrap = function(node) {
         return node;
       };
     }
   }
-  if (window.HTMLImports) {
-    window.HTMLImports.__importsParsingHook = function(elt) {
-      if (elt.import) {
-        upgradeDocument(wrap(elt.import));
+  function bootstrap() {
+    upgradeDocumentTree(wrap(document));
+    if (window.HTMLImports) {
+      HTMLImports.__importsParsingHook = function(elt) {
+        upgradeDocumentTree(wrap(elt.import));
+      };
+    }
+    CustomElements.ready = true;
+    setTimeout(function() {
+      CustomElements.readyTime = Date.now();
+      if (window.HTMLImports) {
+        CustomElements.elapsed = CustomElements.readyTime - HTMLImports.readyTime;
       }
+      document.dispatchEvent(new CustomEvent("WebComponentsReady", {
+        bubbles: true
+      }));
+    });
+  }
+  if (isIE11OrOlder && typeof window.CustomEvent !== "function") {
+    window.CustomEvent = function(inType, params) {
+      params = params || {};
+      var e = document.createEvent("CustomEvent");
+      e.initCustomEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable), params.detail);
+      return e;
     };
-  }
-  function bootstrap() {
-    upgradeDocumentTree(window.wrap(document));
-    window.CustomElements.ready = true;
-    var requestAnimationFrame = window.requestAnimationFrame || function(f) {
-      setTimeout(f, 16);
-    };
-    requestAnimationFrame(function() {
-      setTimeout(function() {
-        window.CustomElements.readyTime = Date.now();
-        if (window.HTMLImports) {
-          window.CustomElements.elapsed = window.CustomElements.readyTime - window.HTMLImports.readyTime;
-        }
-        document.dispatchEvent(new CustomEvent("WebComponentsReady", {
-          bubbles: true
-        }));
-      });
-    });
+    window.CustomEvent.prototype = window.Event.prototype;
   }
   if (document.readyState === "complete" || scope.flags.eager) {
     bootstrap();
   } else if (document.readyState === "interactive" && !window.attachEvent && (!window.HTMLImports || window.HTMLImports.ready)) {
     bootstrap();
   } else {
-    var loadEvent = window.HTMLImports && !window.HTMLImports.ready ? "HTMLImportsLoaded" : "DOMContentLoaded";
+    var loadEvent = window.HTMLImports && !HTMLImports.ready ? "HTMLImportsLoaded" : "DOMContentLoaded";
     window.addEventListener(loadEvent, bootstrap);
   }
+  scope.isIE11OrOlder = isIE11OrOlder;
 })(window.CustomElements);