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 0.7.24
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];
        if (entry && entry[0] === key) entry[1] = value; else defineProperty(key, this.name, {
          value: [ key, value ],
          writable: true
        });
        return this;
      },
      get: function(key) {
        var entry;
        return (entry = key[this.name]) && entry[0] === key ? entry[1] : undefined;
      },
      "delete": function(key) {
        var entry = key[this.name];
        if (!entry || entry[0] !== key) return false;
        entry[0] = entry[1] = undefined;
        return true;
      },
      has: function(key) {
        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) {
      if (e.data === sentinel) {
        var queue = setImmediateQueue;
        setImmediateQueue = [];
        queue.forEach(function(func) {
          func();
        });
      }
    });
    setImmediate = function(func) {
      setImmediateQueue.push(func);
      window.postMessage(sentinel, "*");
    };
  }
  var isScheduled = false;
  var scheduledObservers = [];
  function scheduleCallback(observer) {
    scheduledObservers.push(observer);
    if (!isScheduled) {
      isScheduled = true;
      setImmediate(dispatchCallbacks);
    }
  }
  function wrapIfNeeded(node) {
    return window.ShadowDOMPolyfill && window.ShadowDOMPolyfill.wrapIfNeeded(node) || node;
  }
  function dispatchCallbacks() {
    isScheduled = false;
    var observers = scheduledObservers;
    scheduledObservers = [];
    observers.sort(function(o1, o2) {
      return o1.uid_ - o2.uid_;
    });
    var anyNonEmpty = false;
    observers.forEach(function(observer) {
      var queue = observer.takeRecords();
      removeTransientObserversFor(observer);
      if (queue.length) {
        observer.callback_(queue, observer);
        anyNonEmpty = true;
      }
    });
    if (anyNonEmpty) dispatchCallbacks();
  }
  function removeTransientObserversFor(observer) {
    observer.nodes_.forEach(function(node) {
      var registrations = registrationsTable.get(node);
      if (!registrations) return;
      registrations.forEach(function(registration) {
        if (registration.observer === observer) registration.removeTransientObservers();
      });
    });
  }
  function forEachAncestorAndObserverEnqueueRecord(target, callback) {
    for (var node = target; node; node = node.parentNode) {
      var registrations = registrationsTable.get(node);
      if (registrations) {
        for (var j = 0; j < registrations.length; j++) {
          var registration = registrations[j];
          var options = registration.options;
          if (node !== target && !options.subtree) continue;
          var record = callback(options);
          if (record) registration.enqueue(record);
        }
      }
    }
  }
  var uidCounter = 0;
  function JsMutationObserver(callback) {
    this.callback_ = callback;
    this.nodes_ = [];
    this.records_ = [];
    this.uid_ = ++uidCounter;
  }
  JsMutationObserver.prototype = {
    observe: function(target, options) {
      target = wrapIfNeeded(target);
      if (!options.childList && !options.attributes && !options.characterData || options.attributeOldValue && !options.attributes || options.attributeFilter && options.attributeFilter.length && !options.attributes || options.characterDataOldValue && !options.characterData) {
        throw new SyntaxError();
      }
      var registrations = registrationsTable.get(target);
      if (!registrations) registrationsTable.set(target, registrations = []);
      var registration;
      for (var i = 0; i < registrations.length; i++) {
        if (registrations[i].observer === this) {
          registration = registrations[i];
          registration.removeListeners();
          registration.options = options;
          break;
        }
      }
      if (!registration) {
        registration = new Registration(this, target, options);
        registrations.push(registration);
        this.nodes_.push(target);
      }
      registration.addListeners();
    },
    disconnect: function() {
      this.nodes_.forEach(function(node) {
        var registrations = registrationsTable.get(node);
        for (var i = 0; i < registrations.length; i++) {
          var registration = registrations[i];
          if (registration.observer === this) {
            registration.removeListeners();
            registrations.splice(i, 1);
            break;
          }
        }
      }, this);
      this.records_ = [];
    },
    takeRecords: function() {
      var copyOfRecords = this.records_;
      this.records_ = [];
      return copyOfRecords;
    }
  };
  function MutationRecord(type, target) {
    this.type = type;
    this.target = target;
    this.addedNodes = [];
    this.removedNodes = [];
    this.previousSibling = null;
    this.nextSibling = null;
    this.attributeName = null;
    this.attributeNamespace = null;
    this.oldValue = null;
  }
  function copyMutationRecord(original) {
    var record = new MutationRecord(original.type, original.target);
    record.addedNodes = original.addedNodes.slice();
    record.removedNodes = original.removedNodes.slice();
    record.previousSibling = original.previousSibling;
    record.nextSibling = original.nextSibling;
    record.attributeName = original.attributeName;
    record.attributeNamespace = original.attributeNamespace;
    record.oldValue = original.oldValue;
    return record;
  }
  var currentRecord, recordWithOldValue;
  function getRecord(type, target) {
    return currentRecord = new MutationRecord(type, target);
  }
  function getRecordWithOldValue(oldValue) {
    if (recordWithOldValue) return recordWithOldValue;
    recordWithOldValue = copyMutationRecord(currentRecord);
    recordWithOldValue.oldValue = oldValue;
    return recordWithOldValue;
  }
  function clearRecords() {
    currentRecord = recordWithOldValue = undefined;
  }
  function recordRepresentsCurrentMutation(record) {
    return record === recordWithOldValue || record === currentRecord;
  }
  function selectRecord(lastRecord, newRecord) {
    if (lastRecord === newRecord) return lastRecord;
    if (recordWithOldValue && recordRepresentsCurrentMutation(lastRecord)) return recordWithOldValue;
    return null;
  }
  function Registration(observer, target, options) {
    this.observer = observer;
    this.target = target;
    this.options = options;
    this.transientObservedNodes = [];
  }
  Registration.prototype = {
    enqueue: function(record) {
      var records = this.observer.records_;
      var length = records.length;
      if (records.length > 0) {
        var lastRecord = records[length - 1];
        var recordToReplaceLast = selectRecord(lastRecord, record);
        if (recordToReplaceLast) {
          records[length - 1] = recordToReplaceLast;
          return;
        }
      } else {
        scheduleCallback(this.observer);
      }
      records[length] = record;
    },
    addListeners: function() {
      this.addListeners_(this.target);
    },
    addListeners_: function(node) {
      var options = this.options;
      if (options.attributes) node.addEventListener("DOMAttrModified", this, true);
      if (options.characterData) node.addEventListener("DOMCharacterDataModified", this, true);
      if (options.childList) node.addEventListener("DOMNodeInserted", this, true);
      if (options.childList || options.subtree) node.addEventListener("DOMNodeRemoved", this, true);
    },
    removeListeners: function() {
      this.removeListeners_(this.target);
    },
    removeListeners_: function(node) {
      var options = this.options;
      if (options.attributes) node.removeEventListener("DOMAttrModified", this, true);
      if (options.characterData) node.removeEventListener("DOMCharacterDataModified", this, true);
      if (options.childList) node.removeEventListener("DOMNodeInserted", this, true);
      if (options.childList || options.subtree) node.removeEventListener("DOMNodeRemoved", this, true);
    },
    addTransientObserver: function(node) {
      if (node === this.target) return;
      this.addListeners_(node);
      this.transientObservedNodes.push(node);
      var registrations = registrationsTable.get(node);
      if (!registrations) registrationsTable.set(node, registrations = []);
      registrations.push(this);
    },
    removeTransientObservers: function() {
      var transientObservedNodes = this.transientObservedNodes;
      this.transientObservedNodes = [];
      transientObservedNodes.forEach(function(node) {
        this.removeListeners_(node);
        var registrations = registrationsTable.get(node);
        for (var i = 0; i < registrations.length; i++) {
          if (registrations[i] === this) {
            registrations.splice(i, 1);
            break;
          }
        }
      }, this);
    },
    handleEvent: function(e) {
      e.stopImmediatePropagation();
      switch (e.type) {
       case "DOMAttrModified":
        var name = e.attrName;
        var namespace = e.relatedNode.namespaceURI;
        var target = e.target;
        var record = new getRecord("attributes", target);
        record.attributeName = name;
        record.attributeNamespace = namespace;
        var oldValue = e.attrChange === MutationEvent.ADDITION ? null : e.prevValue;
        forEachAncestorAndObserverEnqueueRecord(target, function(options) {
          if (!options.attributes) return;
          if (options.attributeFilter && options.attributeFilter.length && options.attributeFilter.indexOf(name) === -1 && options.attributeFilter.indexOf(namespace) === -1) {
            return;
          }
          if (options.attributeOldValue) return getRecordWithOldValue(oldValue);
          return record;
        });
        break;

       case "DOMCharacterDataModified":
        var target = e.target;
        var record = getRecord("characterData", target);
        var oldValue = e.prevValue;
        forEachAncestorAndObserverEnqueueRecord(target, function(options) {
          if (!options.characterData) return;
          if (options.characterDataOldValue) return getRecordWithOldValue(oldValue);
          return record;
        });
        break;

       case "DOMNodeRemoved":
        this.addTransientObserver(e.target);

       case "DOMNodeInserted":
        var changedNode = e.target;
        var addedNodes, removedNodes;
        if (e.type === "DOMNodeInserted") {
          addedNodes = [ changedNode ];
          removedNodes = [];
        } else {
          addedNodes = [];
          removedNodes = [ changedNode ];
        }
        var previousSibling = changedNode.previousSibling;
        var nextSibling = changedNode.nextSibling;
        var record = getRecord("childList", e.target.parentNode);
        record.addedNodes = addedNodes;
        record.removedNodes = removedNodes;
        record.previousSibling = previousSibling;
        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 && window.performance.now)) {
    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);

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);

window.CustomElements.addModule(function(scope) {
  var IMPORT_LINK_TYPE = window.HTMLImports ? window.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) {
    var e = node.firstElementChild;
    if (!e) {
      e = node.firstChild;
      while (e && e.nodeType !== Node.ELEMENT_NODE) {
        e = e.nextSibling;
      }
    }
    while (e) {
      if (find(e, data) !== true) {
        findAllElements(e, find, data);
      }
      e = e.nextElementSibling;
    }
    return null;
  }
  function forRoots(node, cb) {
    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);
    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) {
  var flags = scope.flags;
  var forSubtree = scope.forSubtree;
  var forDocumentTree = scope.forDocumentTree;
  function addedNode(node, isAttached) {
    return added(node, isAttached) || addedSubtree(node, isAttached);
  }
  function added(node, isAttached) {
    if (scope.upgrade(node, isAttached)) {
      return true;
    }
    if (isAttached) {
      attached(node);
    }
  }
  function addedSubtree(node, isAttached) {
    forSubtree(node, function(e) {
      if (added(e, isAttached)) {
        return true;
      }
    });
  }
  var hasThrottledAttached = window.MutationObserver._isPolyfilled && flags["throttle-attached"];
  scope.hasPolyfillMutations = hasThrottledAttached;
  scope.hasThrottledAttached = hasThrottledAttached;
  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) {
      deferMutation(function() {
        _attached(element);
      });
    } else {
      _attached(element);
    }
  }
  function _attached(element) {
    if (element.__upgraded__ && !element.__attached) {
      element.__attached = true;
      if (element.attachedCallback) {
        element.attachedCallback();
      }
    }
  }
  function detachedNode(node) {
    detached(node);
    forSubtree(node, function(e) {
      detached(e);
    });
  }
  function detached(element) {
    if (hasThrottledAttached) {
      deferMutation(function() {
        _detached(element);
      });
    } else {
      _detached(element);
    }
  }
  function _detached(element) {
    if (element.__upgraded__ && element.__attached) {
      element.__attached = false;
      if (element.detachedCallback) {
        element.detachedCallback();
      }
    }
  }
  function inDocument(element) {
    var p = element;
    var doc = window.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) {
    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);
        });
        forEach(mx.removedNodes, function(n) {
          if (!n.localName) {
            return;
          }
          detachedNode(n);
        });
      }
    });
    flags.dom && console.groupEnd();
  }
  function takeRecords(node) {
    node = window.wrap(node);
    if (!node) {
      node = window.wrap(document);
    }
    while (node.parentNode) {
      node = node.parentNode;
    }
    var observer = node.__observer;
    if (observer) {
      handler(node, 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));
    observer.observe(inRoot, {
      childList: true,
      subtree: true
    });
    inRoot.__observer = observer;
  }
  function upgradeDocument(doc) {
    doc = window.wrap(doc);
    flags.dom && console.group("upgradeDocument: ", doc.baseURI.split("/").pop());
    var isMainDocument = doc === window.wrap(document);
    addedNode(doc, isMainDocument);
    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);
      return root;
    };
  }
  scope.watchShadow = watchShadow;
  scope.upgradeDocumentTree = upgradeDocumentTree;
  scope.upgradeDocument = upgradeDocument;
  scope.upgradeSubtree = addedSubtree;
  scope.upgradeAll = addedNode;
  scope.attached = attached;
  scope.takeRecords = takeRecords;
});

window.CustomElements.addModule(function(scope) {
  var flags = scope.flags;
  function upgrade(node, isAttached) {
    if (node.localName === "template") {
      if (window.HTMLTemplateElement && HTMLTemplateElement.decorate) {
        HTMLTemplateElement.decorate(node);
      }
    }
    if (!node.__upgraded__ && node.nodeType === Node.ELEMENT_NODE) {
      var is = node.getAttribute("is");
      var definition = scope.getRegisteredDefinition(node.localName) || scope.getRegisteredDefinition(is);
      if (definition) {
        if (is && definition.tag == node.localName || !is && !definition.extends) {
          return upgradeWithDefinition(node, definition, isAttached);
        }
      }
    }
  }
  function upgradeWithDefinition(element, definition, isAttached) {
    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);
    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;
    }
  }
  function customMixin(inTarget, inSrc, inNative) {
    var used = {};
    var p = inSrc;
    while (p !== inNative && p !== HTMLElement.prototype) {
      var keys = Object.getOwnPropertyNames(p);
      for (var i = 0, k; k = keys[i]; i++) {
        if (!used[k]) {
          Object.defineProperty(inTarget, k, Object.getOwnPropertyDescriptor(p, k));
          used[k] = 1;
        }
      }
      p = Object.getPrototypeOf(p);
    }
  }
  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;
  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) {
      upgradeDocumentTree(document);
    }
    return definition.ctor;
  }
  function overrideAttributeApi(prototype) {
    if (prototype.setAttribute._polyfilled) {
      return;
    }
    var setAttribute = prototype.setAttribute;
    prototype.setAttribute = function(name, value) {
      changeAttribute.call(this, name, value, setAttribute);
    };
    var removeAttribute = prototype.removeAttribute;
    prototype.removeAttribute = function(name) {
      changeAttribute.call(this, name, null, removeAttribute);
    };
    prototype.setAttribute._polyfilled = true;
  }
  function changeAttribute(name, value, operation) {
    name = name.toLowerCase();
    var oldValue = this.getAttribute(name);
    operation.apply(this, arguments);
    var newValue = this.getAttribute(name);
    if (this.attributeChangedCallback && newValue !== oldValue) {
      this.attributeChangedCallback(name, oldValue, newValue);
    }
  }
  function isReservedTag(name) {
    for (var i = 0; i < reservedTagList.length; i++) {
      if (name === reservedTagList[i]) {
        return true;
      }
    }
  }
  var reservedTagList = [ "annotation-xml", "color-profile", "font-face", "font-face-src", "font-face-uri", "font-face-format", "font-face-name", "missing-glyph" ];
  function ancestry(extnds) {
    var extendee = getRegisteredDefinition(extnds);
    if (extendee) {
      return ancestry(extendee.extends).concat([ extendee ]);
    }
    return [];
  }
  function resolveTagName(definition) {
    var baseTag = definition.extends;
    for (var i = 0, a; a = definition.ancestry[i]; i++) {
      baseTag = a.is && a.tag;
    }
    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 proto = definition.prototype, ancestor;
      var foundPrototype = false;
      while (proto) {
        if (proto == nativePrototype) {
          foundPrototype = true;
        }
        ancestor = Object.getPrototypeOf(proto);
        if (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");
  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;
  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;
    } 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(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
        }));
      });
    });
  }
  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";
    window.addEventListener(loadEvent, bootstrap);
  }
})(window.CustomElements);