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bower_components/webcomponentsjs/CustomElements.js 31.4 KB
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  /**
   * @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
   */
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  // @version 0.7.15
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  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) {
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    if (global.JsMutationObserver) {
      return;
    }
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    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;
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    if (!global.MutationObserver) {
      global.MutationObserver = JsMutationObserver;
      JsMutationObserver._isPolyfilled = true;
    }
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  })(self);
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  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);
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    scope.isIE = /Trident/.test(navigator.userAgent);
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    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;
        }
      });
    }
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    var hasThrottledAttached = window.MutationObserver._isPolyfilled && flags["throttle-attached"];
    scope.hasPolyfillMutations = hasThrottledAttached;
    scope.hasThrottledAttached = hasThrottledAttached;
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    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) {
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      if (hasThrottledAttached) {
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        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) {
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      if (hasThrottledAttached) {
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        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;
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    scope.upgradeDocument = upgradeDocument;
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    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.__upgraded__ && node.nodeType === Node.ELEMENT_NODE) {
        var is = node.getAttribute("is");
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        var definition = scope.getRegisteredDefinition(node.localName) || scope.getRegisteredDefinition(is);
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        if (definition) {
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          if (is && definition.tag == node.localName || !is && !definition.extends) {
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            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) {
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    var isIE = scope.isIE;
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    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();
      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");
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    if (isIE) {
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      (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;
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    var isIE = scope.isIE;
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    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;
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    var upgradeDocument = scope.upgradeDocument;
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    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;
        };
      }
    }
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    if (window.HTMLImports) {
      window.HTMLImports.__importsParsingHook = function(elt) {
        if (elt.import) {
          upgradeDocument(wrap(elt.import));
        }
      };
    }
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    function bootstrap() {
      upgradeDocumentTree(window.wrap(document));
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      window.CustomElements.ready = true;
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      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
          }));
        });
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      });
    }
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    if (!window.CustomEvent || isIE && typeof window.CustomEvent !== "function") {
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      window.CustomEvent = function(inType, params) {
        params = params || {};
        var e = document.createEvent("CustomEvent");
        e.initCustomEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable), params.detail);
        e.preventDefault = function() {
          Object.defineProperty(this, "defaultPrevented", {
            get: function() {
              return true;
            }
          });
        };
        return e;
      };
      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";
      window.addEventListener(loadEvent, bootstrap);
    }
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  })(window.CustomElements);