Removed Polymer from Observatory deps

packages/web_components/lib/webcomponents.js

Index: packages/web_components/lib/webcomponents.js
diff --git a/packages/web_components/lib/webcomponents.js b/packages/web_components/lib/webcomponents.js
index 8e6523a8fd8c52a0263c1c1345f5eb25290c594f..8e9feb24c2ae1323c05ac9b2175988e786bdff94 100644
--- a/packages/web_components/lib/webcomponents.js
+++ b/packages/web_components/lib/webcomponents.js
@@ -7,17 +7,21 @@
  * 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 0.5.1
-window.WebComponents = window.WebComponents || {};
-
-(function(scope) {
-  var flags = scope.flags || {};
+// @version 0.7.21
+(function() {
+  window.WebComponents = window.WebComponents || {
+    flags: {}
+  };
   var file = "webcomponents.js";
   var script = document.querySelector('script[src*="' + file + '"]');
+  var flags = {};
   if (!flags.noOpts) {
-    location.search.slice(1).split("&").forEach(function(o) {
-      o = o.split("=");
-      o[0] && (flags[o[0]] = o[1] || true);
+    location.search.slice(1).split("&").forEach(function(option) {
+      var parts = option.split("=");
+      var match;
+      if (parts[0] && (match = parts[0].match(/wc-(.+)/))) {
+        flags[match[1]] = parts[1] || true;
+      }
     });
     if (script) {
       for (var i = 0, a; a = script.attributes[i]; i++) {
@@ -26,7 +30,7 @@ window.WebComponents = window.WebComponents || {};
         }
       }
     }
-    if (flags.log) {
+    if (flags.log && flags.log.split) {
       var parts = flags.log.split(",");
       flags.log = {};
       parts.forEach(function(f) {
@@ -48,8 +52,8 @@ window.WebComponents = window.WebComponents || {};
     };
     window.CustomElements.flags.register = flags.register;
   }
-  scope.flags = flags;
-})(WebComponents);
+  WebComponents.flags = flags;
+})();
 
 if (WebComponents.flags.shadow) {
   if (typeof WeakMap === "undefined") {
@@ -155,13 +159,20 @@ if (WebComponents.flags.shadow) {
       defineProperty(object, name, nonEnumerableDataDescriptor);
     }
     getOwnPropertyNames(window);
-    function getWrapperConstructor(node) {
+    function getWrapperConstructor(node, opt_instance) {
       var nativePrototype = node.__proto__ || Object.getPrototypeOf(node);
+      if (isFirefox) {
+        try {
+          getOwnPropertyNames(nativePrototype);
+        } catch (error) {
+          nativePrototype = nativePrototype.__proto__;
+        }
+      }
       var wrapperConstructor = constructorTable.get(nativePrototype);
       if (wrapperConstructor) return wrapperConstructor;
       var parentWrapperConstructor = getWrapperConstructor(nativePrototype);
       var GeneratedWrapper = createWrapperConstructor(parentWrapperConstructor);
-      registerInternal(nativePrototype, GeneratedWrapper, node);
+      registerInternal(nativePrototype, GeneratedWrapper, opt_instance);
       return GeneratedWrapper;
     }
     function addForwardingProperties(nativePrototype, wrapperPrototype) {
@@ -181,7 +192,7 @@ if (WebComponents.flags.shadow) {
       return /^on[a-z]+$/.test(name);
     }
     function isIdentifierName(name) {
-      return /^\w[a-zA-Z_0-9]*$/.test(name);
+      return /^[a-zA-Z_$][a-zA-Z_$0-9]*$/.test(name);
     }
     function getGetter(name) {
       return hasEval && isIdentifierName(name) ? new Function("return this.__impl4cf1e782hg__." + name) : function() {
@@ -221,8 +232,10 @@ if (WebComponents.flags.shadow) {
         }
         var descriptor = getDescriptor(source, name);
         var getter, setter;
-        if (allowMethod && typeof descriptor.value === "function") {
-          target[name] = getMethod(name);
+        if (typeof descriptor.value === "function") {
+          if (allowMethod) {
+            target[name] = getMethod(name);
+          }
           continue;
         }
         var isEvent = isEventHandlerName(name);
@@ -230,15 +243,19 @@ if (WebComponents.flags.shadow) {
         if (descriptor.writable || descriptor.set || isBrokenSafari) {
           if (isEvent) setter = scope.getEventHandlerSetter(name); else setter = getSetter(name);
         }
+        var configurable = isBrokenSafari || descriptor.configurable;
         defineProperty(target, name, {
           get: getter,
           set: setter,
-          configurable: descriptor.configurable,
+          configurable: configurable,
           enumerable: descriptor.enumerable
         });
       }
     }
     function register(nativeConstructor, wrapperConstructor, opt_instance) {
+      if (nativeConstructor == null) {
+        return;
+      }
       var nativePrototype = nativeConstructor.prototype;
       registerInternal(nativePrototype, wrapperConstructor, opt_instance);
       mixinStatics(wrapperConstructor, nativeConstructor);
@@ -281,7 +298,11 @@ if (WebComponents.flags.shadow) {
     function wrap(impl) {
       if (impl === null) return null;
       assert(isNative(impl));
-      return impl.__wrapper8e3dd93a60__ || (impl.__wrapper8e3dd93a60__ = new (getWrapperConstructor(impl))(impl));
+      var wrapper = impl.__wrapper8e3dd93a60__;
+      if (wrapper != null) {
+        return wrapper;
+      }
+      return impl.__wrapper8e3dd93a60__ = new (getWrapperConstructor(impl, impl))(impl);
     }
     function unwrap(wrapper) {
       if (wrapper === null) return null;
@@ -331,11 +352,13 @@ if (WebComponents.flags.shadow) {
         });
       });
     }
+    scope.addForwardingProperties = addForwardingProperties;
     scope.assert = assert;
     scope.constructorTable = constructorTable;
     scope.defineGetter = defineGetter;
     scope.defineWrapGetter = defineWrapGetter;
     scope.forwardMethodsToWrapper = forwardMethodsToWrapper;
+    scope.isIdentifierName = isIdentifierName;
     scope.isWrapper = isWrapper;
     scope.isWrapperFor = isWrapperFor;
     scope.mixin = mixin;
@@ -1137,6 +1160,24 @@ if (WebComponents.flags.shadow) {
         stopImmediatePropagationTable.set(this, true);
       }
     };
+    var supportsDefaultPrevented = function() {
+      var e = document.createEvent("Event");
+      e.initEvent("test", true, true);
+      e.preventDefault();
+      return e.defaultPrevented;
+    }();
+    if (!supportsDefaultPrevented) {
+      Event.prototype.preventDefault = function() {
+        if (!this.cancelable) return;
+        unsafeUnwrap(this).preventDefault();
+        Object.defineProperty(this, "defaultPrevented", {
+          get: function() {
+            return true;
+          },
+          configurable: true
+        });
+      };
+    }
     registerWrapper(OriginalEvent, Event, document.createEvent("Event"));
     function unwrapOptions(options) {
       if (!options || !options.relatedTarget) return options;
@@ -1756,11 +1797,12 @@ if (WebComponents.flags.shadow) {
     var OriginalDocumentFragment = window.DocumentFragment;
     var originalAppendChild = OriginalNode.prototype.appendChild;
     var originalCompareDocumentPosition = OriginalNode.prototype.compareDocumentPosition;
+    var originalIsEqualNode = OriginalNode.prototype.isEqualNode;
     var originalInsertBefore = OriginalNode.prototype.insertBefore;
     var originalRemoveChild = OriginalNode.prototype.removeChild;
     var originalReplaceChild = OriginalNode.prototype.replaceChild;
-    var isIe = /Trident/.test(navigator.userAgent);
-    var removeChildOriginalHelper = isIe ? function(parent, child) {
+    var isIEOrEdge = /Trident|Edge/.test(navigator.userAgent);
+    var removeChildOriginalHelper = isIEOrEdge ? function(parent, child) {
       try {
         originalRemoveChild.call(parent, child);
       } catch (ex) {
@@ -1984,6 +2026,9 @@ if (WebComponents.flags.shadow) {
       compareDocumentPosition: function(otherNode) {
         return originalCompareDocumentPosition.call(unsafeUnwrap(this), unwrapIfNeeded(otherNode));
       },
+      isEqualNode: function(otherNode) {
+        return originalIsEqualNode.call(unsafeUnwrap(this), unwrapIfNeeded(otherNode));
+      },
       normalize: function() {
         var nodes = snapshotNodeList(this.childNodes);
         var remNodes = [];
@@ -1992,7 +2037,7 @@ if (WebComponents.flags.shadow) {
         for (var i = 0, n; i < nodes.length; i++) {
           n = nodes[i];
           if (n.nodeType === Node.TEXT_NODE) {
-            if (!modNode && !n.data.length) this.removeNode(n); else if (!modNode) modNode = n; else {
+            if (!modNode && !n.data.length) this.removeChild(n); else if (!modNode) modNode = n; else {
               s += n.data;
               remNodes.push(n);
             }
@@ -2060,7 +2105,10 @@ if (WebComponents.flags.shadow) {
       return index;
     }
     function shimSelector(selector) {
-      return String(selector).replace(/\/deep\//g, " ");
+      return String(selector).replace(/\/deep\/|::shadow|>>>/g, " ");
+    }
+    function shimMatchesSelector(selector) {
+      return String(selector).replace(/:host\(([^\s]+)\)/g, "$1").replace(/([^\s]):host/g, "$1").replace(":host", "*").replace(/\^|\/shadow\/|\/shadow-deep\/|::shadow|\/deep\/|::content|>>>/g, " ");
     }
     function findOne(node, selector) {
       var m, el = node.firstElementChild;
@@ -2151,6 +2199,12 @@ if (WebComponents.flags.shadow) {
         return result;
       }
     };
+    var MatchesInterface = {
+      matches: function(selector) {
+        selector = shimMatchesSelector(selector);
+        return scope.originalMatches.call(unsafeUnwrap(this), selector);
+      }
+    };
     function getElementsByTagNameFiltered(p, index, result, localName, lowercase) {
       var target = unsafeUnwrap(this);
       var list;
@@ -2205,6 +2259,7 @@ if (WebComponents.flags.shadow) {
     };
     scope.GetElementsByInterface = GetElementsByInterface;
     scope.SelectorsInterface = SelectorsInterface;
+    scope.MatchesInterface = MatchesInterface;
   })(window.ShadowDOMPolyfill);
   (function(scope) {
     "use strict";
@@ -2257,7 +2312,14 @@ if (WebComponents.flags.shadow) {
         return backwardsElement(this.previousSibling);
       }
     };
+    var NonElementParentNodeInterface = {
+      getElementById: function(id) {
+        if (/[ \t\n\r\f]/.test(id)) return null;
+        return this.querySelector('[id="' + id + '"]');
+      }
+    };
     scope.ChildNodeInterface = ChildNodeInterface;
+    scope.NonElementParentNodeInterface = NonElementParentNodeInterface;
     scope.ParentNodeInterface = ParentNodeInterface;
   })(window.ShadowDOMPolyfill);
   (function(scope) {
@@ -2274,6 +2336,12 @@ if (WebComponents.flags.shadow) {
     }
     CharacterData.prototype = Object.create(Node.prototype);
     mixin(CharacterData.prototype, {
+      get nodeValue() {
+        return this.data;
+      },
+      set nodeValue(data) {
+        this.data = data;
+      },
       get textContent() {
         return this.data;
       },
@@ -2327,53 +2395,59 @@ if (WebComponents.flags.shadow) {
   })(window.ShadowDOMPolyfill);
   (function(scope) {
     "use strict";
-    var setWrapper = scope.setWrapper;
+    if (!window.DOMTokenList) {
+      console.warn("Missing DOMTokenList prototype, please include a " + "compatible classList polyfill such as http://goo.gl/uTcepH.");
+      return;
+    }
     var unsafeUnwrap = scope.unsafeUnwrap;
+    var enqueueMutation = scope.enqueueMutation;
+    function getClass(el) {
+      return unsafeUnwrap(el).getAttribute("class");
+    }
+    function enqueueClassAttributeChange(el, oldValue) {
+      enqueueMutation(el, "attributes", {
+        name: "class",
+        namespace: null,
+        oldValue: oldValue
+      });
+    }
     function invalidateClass(el) {
       scope.invalidateRendererBasedOnAttribute(el, "class");
     }
-    function DOMTokenList(impl, ownerElement) {
-      setWrapper(impl, this);
-      this.ownerElement_ = ownerElement;
-    }
-    DOMTokenList.prototype = {
-      constructor: DOMTokenList,
-      get length() {
-        return unsafeUnwrap(this).length;
-      },
-      item: function(index) {
-        return unsafeUnwrap(this).item(index);
-      },
-      contains: function(token) {
-        return unsafeUnwrap(this).contains(token);
-      },
-      add: function() {
-        unsafeUnwrap(this).add.apply(unsafeUnwrap(this), arguments);
-        invalidateClass(this.ownerElement_);
-      },
-      remove: function() {
-        unsafeUnwrap(this).remove.apply(unsafeUnwrap(this), arguments);
-        invalidateClass(this.ownerElement_);
-      },
-      toggle: function(token) {
-        var rv = unsafeUnwrap(this).toggle.apply(unsafeUnwrap(this), arguments);
-        invalidateClass(this.ownerElement_);
-        return rv;
-      },
-      toString: function() {
-        return unsafeUnwrap(this).toString();
+    function changeClass(tokenList, method, args) {
+      var ownerElement = tokenList.ownerElement_;
+      if (ownerElement == null) {
+        return method.apply(tokenList, args);
+      }
+      var oldValue = getClass(ownerElement);
+      var retv = method.apply(tokenList, args);
+      if (getClass(ownerElement) !== oldValue) {
+        enqueueClassAttributeChange(ownerElement, oldValue);
+        invalidateClass(ownerElement);
       }
+      return retv;
+    }
+    var oldAdd = DOMTokenList.prototype.add;
+    DOMTokenList.prototype.add = function() {
+      changeClass(this, oldAdd, arguments);
+    };
+    var oldRemove = DOMTokenList.prototype.remove;
+    DOMTokenList.prototype.remove = function() {
+      changeClass(this, oldRemove, arguments);
+    };
+    var oldToggle = DOMTokenList.prototype.toggle;
+    DOMTokenList.prototype.toggle = function() {
+      return changeClass(this, oldToggle, arguments);
     };
-    scope.wrappers.DOMTokenList = DOMTokenList;
   })(window.ShadowDOMPolyfill);
   (function(scope) {
     "use strict";
     var ChildNodeInterface = scope.ChildNodeInterface;
     var GetElementsByInterface = scope.GetElementsByInterface;
     var Node = scope.wrappers.Node;
-    var DOMTokenList = scope.wrappers.DOMTokenList;
     var ParentNodeInterface = scope.ParentNodeInterface;
     var SelectorsInterface = scope.SelectorsInterface;
+    var MatchesInterface = scope.MatchesInterface;
     var addWrapNodeListMethod = scope.addWrapNodeListMethod;
     var enqueueMutation = scope.enqueueMutation;
     var mixin = scope.mixin;
@@ -2428,13 +2502,13 @@ if (WebComponents.flags.shadow) {
         enqueAttributeChange(this, name, oldValue);
         invalidateRendererBasedOnAttribute(this, name);
       },
-      matches: function(selector) {
-        return originalMatches.call(unsafeUnwrap(this), selector);
-      },
       get classList() {
         var list = classListTable.get(this);
         if (!list) {
-          classListTable.set(this, list = new DOMTokenList(unsafeUnwrap(this).classList, this));
+          list = unsafeUnwrap(this).classList;
+          if (!list) return;
+          list.ownerElement_ = this;
+          classListTable.set(this, list);
         }
         return list;
       },
@@ -2465,9 +2539,11 @@ if (WebComponents.flags.shadow) {
     mixin(Element.prototype, GetElementsByInterface);
     mixin(Element.prototype, ParentNodeInterface);
     mixin(Element.prototype, SelectorsInterface);
+    mixin(Element.prototype, MatchesInterface);
     registerWrapper(OriginalElement, Element, document.createElementNS(null, "x"));
     scope.invalidateRendererBasedOnAttribute = invalidateRendererBasedOnAttribute;
     scope.matchesNames = matchesNames;
+    scope.originalMatches = originalMatches;
     scope.wrappers.Element = Element;
   })(window.ShadowDOMPolyfill);
   (function(scope) {
@@ -2519,6 +2595,12 @@ if (WebComponents.flags.shadow) {
     }
     var voidElements = makeSet([ "area", "base", "br", "col", "command", "embed", "hr", "img", "input", "keygen", "link", "meta", "param", "source", "track", "wbr" ]);
     var plaintextParents = makeSet([ "style", "script", "xmp", "iframe", "noembed", "noframes", "plaintext", "noscript" ]);
+    var XHTML_NS = "http://www.w3.org/1999/xhtml";
+    function needsSelfClosingSlash(node) {
+      if (node.namespaceURI !== XHTML_NS) return true;
+      var doctype = node.ownerDocument.doctype;
+      return doctype && doctype.publicId && doctype.systemId;
+    }
     function getOuterHTML(node, parentNode) {
       switch (node.nodeType) {
        case Node.ELEMENT_NODE:
@@ -2528,9 +2610,11 @@ if (WebComponents.flags.shadow) {
         for (var i = 0, attr; attr = attrs[i]; i++) {
           s += " " + attr.name + '="' + escapeAttr(attr.value) + '"';
         }
-        s += ">";
-        if (voidElements[tagName]) return s;
-        return s + getInnerHTML(node) + "</" + tagName + ">";
+        if (voidElements[tagName]) {
+          if (needsSelfClosingSlash(node)) s += "/";
+          return s + ">";
+        }
+        return s + ">" + getInnerHTML(node) + "</" + tagName + ">";
 
        case Node.TEXT_NODE:
         var data = node.data;
@@ -2688,7 +2772,7 @@ if (WebComponents.flags.shadow) {
         enumerable: true
       });
     }
-    [ "getBoundingClientRect", "getClientRects", "scrollIntoView" ].forEach(methodRequiresRendering);
+    [ "focus", "getBoundingClientRect", "getClientRects", "scrollIntoView" ].forEach(methodRequiresRendering);
     registerWrapper(OriginalHTMLElement, HTMLElement, document.createElement("b"));
     scope.wrappers.HTMLElement = HTMLElement;
     scope.getInnerHTML = getInnerHTML;
@@ -3095,16 +3179,29 @@ if (WebComponents.flags.shadow) {
     "use strict";
     var Element = scope.wrappers.Element;
     var HTMLElement = scope.wrappers.HTMLElement;
-    var registerObject = scope.registerObject;
+    var registerWrapper = scope.registerWrapper;
+    var defineWrapGetter = scope.defineWrapGetter;
+    var unsafeUnwrap = scope.unsafeUnwrap;
+    var wrap = scope.wrap;
+    var mixin = scope.mixin;
     var SVG_NS = "http://www.w3.org/2000/svg";
+    var OriginalSVGElement = window.SVGElement;
     var svgTitleElement = document.createElementNS(SVG_NS, "title");
-    var SVGTitleElement = registerObject(svgTitleElement);
-    var SVGElement = Object.getPrototypeOf(SVGTitleElement.prototype).constructor;
     if (!("classList" in svgTitleElement)) {
       var descr = Object.getOwnPropertyDescriptor(Element.prototype, "classList");
       Object.defineProperty(HTMLElement.prototype, "classList", descr);
       delete Element.prototype.classList;
     }
+    function SVGElement(node) {
+      Element.call(this, node);
+    }
+    SVGElement.prototype = Object.create(Element.prototype);
+    mixin(SVGElement.prototype, {
+      get ownerSVGElement() {
+        return wrap(unsafeUnwrap(this).ownerSVGElement);
+      }
+    });
+    registerWrapper(OriginalSVGElement, SVGElement, document.createElementNS(SVG_NS, "title"));
     scope.wrappers.SVGElement = SVGElement;
   })(window.ShadowDOMPolyfill);
   (function(scope) {
@@ -3210,6 +3307,7 @@ if (WebComponents.flags.shadow) {
   })(window.ShadowDOMPolyfill);
   (function(scope) {
     "use strict";
+    var addForwardingProperties = scope.addForwardingProperties;
     var mixin = scope.mixin;
     var registerWrapper = scope.registerWrapper;
     var setWrapper = scope.setWrapper;
@@ -3234,6 +3332,10 @@ if (WebComponents.flags.shadow) {
         unsafeUnwrap(this).texSubImage2D.apply(unsafeUnwrap(this), arguments);
       }
     });
+    var OriginalWebGLRenderingContextBase = Object.getPrototypeOf(OriginalWebGLRenderingContext.prototype);
+    if (OriginalWebGLRenderingContextBase !== Object.prototype) {
+      addForwardingProperties(OriginalWebGLRenderingContextBase, WebGLRenderingContext.prototype);
+    }
     var instanceProperties = /WebKit/.test(navigator.userAgent) ? {
       drawingBufferHeight: null,
       drawingBufferWidth: null
@@ -3243,30 +3345,153 @@ if (WebComponents.flags.shadow) {
   })(window.ShadowDOMPolyfill);
   (function(scope) {
     "use strict";
+    var Node = scope.wrappers.Node;
+    var GetElementsByInterface = scope.GetElementsByInterface;
+    var NonElementParentNodeInterface = scope.NonElementParentNodeInterface;
+    var ParentNodeInterface = scope.ParentNodeInterface;
+    var SelectorsInterface = scope.SelectorsInterface;
+    var mixin = scope.mixin;
+    var registerObject = scope.registerObject;
+    var registerWrapper = scope.registerWrapper;
+    var OriginalDocumentFragment = window.DocumentFragment;
+    function DocumentFragment(node) {
+      Node.call(this, node);
+    }
+    DocumentFragment.prototype = Object.create(Node.prototype);
+    mixin(DocumentFragment.prototype, ParentNodeInterface);
+    mixin(DocumentFragment.prototype, SelectorsInterface);
+    mixin(DocumentFragment.prototype, GetElementsByInterface);
+    mixin(DocumentFragment.prototype, NonElementParentNodeInterface);
+    registerWrapper(OriginalDocumentFragment, DocumentFragment, document.createDocumentFragment());
+    scope.wrappers.DocumentFragment = DocumentFragment;
+    var Comment = registerObject(document.createComment(""));
+    scope.wrappers.Comment = Comment;
+  })(window.ShadowDOMPolyfill);
+  (function(scope) {
+    "use strict";
+    var DocumentFragment = scope.wrappers.DocumentFragment;
+    var TreeScope = scope.TreeScope;
+    var elementFromPoint = scope.elementFromPoint;
+    var getInnerHTML = scope.getInnerHTML;
+    var getTreeScope = scope.getTreeScope;
+    var mixin = scope.mixin;
+    var rewrap = scope.rewrap;
+    var setInnerHTML = scope.setInnerHTML;
+    var unsafeUnwrap = scope.unsafeUnwrap;
+    var unwrap = scope.unwrap;
+    var wrap = scope.wrap;
+    var shadowHostTable = new WeakMap();
+    var nextOlderShadowTreeTable = new WeakMap();
+    function ShadowRoot(hostWrapper) {
+      var node = unwrap(unsafeUnwrap(hostWrapper).ownerDocument.createDocumentFragment());
+      DocumentFragment.call(this, node);
+      rewrap(node, this);
+      var oldShadowRoot = hostWrapper.shadowRoot;
+      nextOlderShadowTreeTable.set(this, oldShadowRoot);
+      this.treeScope_ = new TreeScope(this, getTreeScope(oldShadowRoot || hostWrapper));
+      shadowHostTable.set(this, hostWrapper);
+    }
+    ShadowRoot.prototype = Object.create(DocumentFragment.prototype);
+    mixin(ShadowRoot.prototype, {
+      constructor: ShadowRoot,
+      get innerHTML() {
+        return getInnerHTML(this);
+      },
+      set innerHTML(value) {
+        setInnerHTML(this, value);
+        this.invalidateShadowRenderer();
+      },
+      get olderShadowRoot() {
+        return nextOlderShadowTreeTable.get(this) || null;
+      },
+      get host() {
+        return shadowHostTable.get(this) || null;
+      },
+      invalidateShadowRenderer: function() {
+        return shadowHostTable.get(this).invalidateShadowRenderer();
+      },
+      elementFromPoint: function(x, y) {
+        return elementFromPoint(this, this.ownerDocument, x, y);
+      },
+      getSelection: function() {
+        return document.getSelection();
+      },
+      get activeElement() {
+        var unwrappedActiveElement = unwrap(this).ownerDocument.activeElement;
+        if (!unwrappedActiveElement || !unwrappedActiveElement.nodeType) return null;
+        var activeElement = wrap(unwrappedActiveElement);
+        while (!this.contains(activeElement)) {
+          while (activeElement.parentNode) {
+            activeElement = activeElement.parentNode;
+          }
+          if (activeElement.host) {
+            activeElement = activeElement.host;
+          } else {
+            return null;
+          }
+        }
+        return activeElement;
+      }
+    });
+    scope.wrappers.ShadowRoot = ShadowRoot;
+  })(window.ShadowDOMPolyfill);
+  (function(scope) {
+    "use strict";
     var registerWrapper = scope.registerWrapper;
     var setWrapper = scope.setWrapper;
     var unsafeUnwrap = scope.unsafeUnwrap;
     var unwrap = scope.unwrap;
     var unwrapIfNeeded = scope.unwrapIfNeeded;
     var wrap = scope.wrap;
+    var getTreeScope = scope.getTreeScope;
     var OriginalRange = window.Range;
+    var ShadowRoot = scope.wrappers.ShadowRoot;
+    function getHost(node) {
+      var root = getTreeScope(node).root;
+      if (root instanceof ShadowRoot) {
+        return root.host;
+      }
+      return null;
+    }
+    function hostNodeToShadowNode(refNode, offset) {
+      if (refNode.shadowRoot) {
+        offset = Math.min(refNode.childNodes.length - 1, offset);
+        var child = refNode.childNodes[offset];
+        if (child) {
+          var insertionPoint = scope.getDestinationInsertionPoints(child);
+          if (insertionPoint.length > 0) {
+            var parentNode = insertionPoint[0].parentNode;
+            if (parentNode.nodeType == Node.ELEMENT_NODE) {
+              refNode = parentNode;
+            }
+          }
+        }
+      }
+      return refNode;
+    }
+    function shadowNodeToHostNode(node) {
+      node = wrap(node);
+      return getHost(node) || node;
+    }
     function Range(impl) {
       setWrapper(impl, this);
     }
     Range.prototype = {
       get startContainer() {
-        return wrap(unsafeUnwrap(this).startContainer);
+        return shadowNodeToHostNode(unsafeUnwrap(this).startContainer);
       },
       get endContainer() {
-        return wrap(unsafeUnwrap(this).endContainer);
+        return shadowNodeToHostNode(unsafeUnwrap(this).endContainer);
       },
       get commonAncestorContainer() {
-        return wrap(unsafeUnwrap(this).commonAncestorContainer);
+        return shadowNodeToHostNode(unsafeUnwrap(this).commonAncestorContainer);
       },
       setStart: function(refNode, offset) {
+        refNode = hostNodeToShadowNode(refNode, offset);
         unsafeUnwrap(this).setStart(unwrapIfNeeded(refNode), offset);
       },
       setEnd: function(refNode, offset) {
+        refNode = hostNodeToShadowNode(refNode, offset);
         unsafeUnwrap(this).setEnd(unwrapIfNeeded(refNode), offset);
       },
       setStartBefore: function(refNode) {
@@ -3328,74 +3553,6 @@ if (WebComponents.flags.shadow) {
   })(window.ShadowDOMPolyfill);
   (function(scope) {
     "use strict";
-    var GetElementsByInterface = scope.GetElementsByInterface;
-    var ParentNodeInterface = scope.ParentNodeInterface;
-    var SelectorsInterface = scope.SelectorsInterface;
-    var mixin = scope.mixin;
-    var registerObject = scope.registerObject;
-    var DocumentFragment = registerObject(document.createDocumentFragment());
-    mixin(DocumentFragment.prototype, ParentNodeInterface);
-    mixin(DocumentFragment.prototype, SelectorsInterface);
-    mixin(DocumentFragment.prototype, GetElementsByInterface);
-    var Comment = registerObject(document.createComment(""));
-    scope.wrappers.Comment = Comment;
-    scope.wrappers.DocumentFragment = DocumentFragment;
-  })(window.ShadowDOMPolyfill);
-  (function(scope) {
-    "use strict";
-    var DocumentFragment = scope.wrappers.DocumentFragment;
-    var TreeScope = scope.TreeScope;
-    var elementFromPoint = scope.elementFromPoint;
-    var getInnerHTML = scope.getInnerHTML;
-    var getTreeScope = scope.getTreeScope;
-    var mixin = scope.mixin;
-    var rewrap = scope.rewrap;
-    var setInnerHTML = scope.setInnerHTML;
-    var unsafeUnwrap = scope.unsafeUnwrap;
-    var unwrap = scope.unwrap;
-    var shadowHostTable = new WeakMap();
-    var nextOlderShadowTreeTable = new WeakMap();
-    var spaceCharRe = /[ \t\n\r\f]/;
-    function ShadowRoot(hostWrapper) {
-      var node = unwrap(unsafeUnwrap(hostWrapper).ownerDocument.createDocumentFragment());
-      DocumentFragment.call(this, node);
-      rewrap(node, this);
-      var oldShadowRoot = hostWrapper.shadowRoot;
-      nextOlderShadowTreeTable.set(this, oldShadowRoot);
-      this.treeScope_ = new TreeScope(this, getTreeScope(oldShadowRoot || hostWrapper));
-      shadowHostTable.set(this, hostWrapper);
-    }
-    ShadowRoot.prototype = Object.create(DocumentFragment.prototype);
-    mixin(ShadowRoot.prototype, {
-      constructor: ShadowRoot,
-      get innerHTML() {
-        return getInnerHTML(this);
-      },
-      set innerHTML(value) {
-        setInnerHTML(this, value);
-        this.invalidateShadowRenderer();
-      },
-      get olderShadowRoot() {
-        return nextOlderShadowTreeTable.get(this) || null;
-      },
-      get host() {
-        return shadowHostTable.get(this) || null;
-      },
-      invalidateShadowRenderer: function() {
-        return shadowHostTable.get(this).invalidateShadowRenderer();
-      },
-      elementFromPoint: function(x, y) {
-        return elementFromPoint(this, this.ownerDocument, x, y);
-      },
-      getElementById: function(id) {
-        if (spaceCharRe.test(id)) return null;
-        return this.querySelector('[id="' + id + '"]');
-      }
-    });
-    scope.wrappers.ShadowRoot = ShadowRoot;
-  })(window.ShadowDOMPolyfill);
-  (function(scope) {
-    "use strict";
     var Element = scope.wrappers.Element;
     var HTMLContentElement = scope.wrappers.HTMLContentElement;
     var HTMLShadowElement = scope.wrappers.HTMLShadowElement;
@@ -3846,7 +4003,7 @@ if (WebComponents.flags.shadow) {
         return wrap(unsafeUnwrap(this).focusNode);
       },
       addRange: function(range) {
-        unsafeUnwrap(this).addRange(unwrap(range));
+        unsafeUnwrap(this).addRange(unwrapIfNeeded(range));
       },
       collapse: function(node, index) {
         unsafeUnwrap(this).collapse(unwrapIfNeeded(node), index);
@@ -3854,9 +4011,6 @@ if (WebComponents.flags.shadow) {
       containsNode: function(node, allowPartial) {
         return unsafeUnwrap(this).containsNode(unwrapIfNeeded(node), allowPartial);
       },
-      extend: function(node, offset) {
-        unsafeUnwrap(this).extend(unwrapIfNeeded(node), offset);
-      },
       getRangeAt: function(index) {
         return wrap(unsafeUnwrap(this).getRangeAt(index));
       },
@@ -3864,25 +4018,78 @@ if (WebComponents.flags.shadow) {
         unsafeUnwrap(this).removeRange(unwrap(range));
       },
       selectAllChildren: function(node) {
-        unsafeUnwrap(this).selectAllChildren(unwrapIfNeeded(node));
+        unsafeUnwrap(this).selectAllChildren(node instanceof ShadowRoot ? unsafeUnwrap(node.host) : unwrapIfNeeded(node));
       },
       toString: function() {
         return unsafeUnwrap(this).toString();
       }
     };
+    if (OriginalSelection.prototype.extend) {
+      Selection.prototype.extend = function(node, offset) {
+        unsafeUnwrap(this).extend(unwrapIfNeeded(node), offset);
+      };
+    }
     registerWrapper(window.Selection, Selection, window.getSelection());
     scope.wrappers.Selection = Selection;
   })(window.ShadowDOMPolyfill);
   (function(scope) {
     "use strict";
+    var registerWrapper = scope.registerWrapper;
+    var setWrapper = scope.setWrapper;
+    var unsafeUnwrap = scope.unsafeUnwrap;
+    var unwrapIfNeeded = scope.unwrapIfNeeded;
+    var wrap = scope.wrap;
+    var OriginalTreeWalker = window.TreeWalker;
+    function TreeWalker(impl) {
+      setWrapper(impl, this);
+    }
+    TreeWalker.prototype = {
+      get root() {
+        return wrap(unsafeUnwrap(this).root);
+      },
+      get currentNode() {
+        return wrap(unsafeUnwrap(this).currentNode);
+      },
+      set currentNode(node) {
+        unsafeUnwrap(this).currentNode = unwrapIfNeeded(node);
+      },
+      get filter() {
+        return unsafeUnwrap(this).filter;
+      },
+      parentNode: function() {
+        return wrap(unsafeUnwrap(this).parentNode());
+      },
+      firstChild: function() {
+        return wrap(unsafeUnwrap(this).firstChild());
+      },
+      lastChild: function() {
+        return wrap(unsafeUnwrap(this).lastChild());
+      },
+      previousSibling: function() {
+        return wrap(unsafeUnwrap(this).previousSibling());
+      },
+      previousNode: function() {
+        return wrap(unsafeUnwrap(this).previousNode());
+      },
+      nextNode: function() {
+        return wrap(unsafeUnwrap(this).nextNode());
+      }
+    };
+    registerWrapper(OriginalTreeWalker, TreeWalker);
+    scope.wrappers.TreeWalker = TreeWalker;
+  })(window.ShadowDOMPolyfill);
+  (function(scope) {
+    "use strict";
     var GetElementsByInterface = scope.GetElementsByInterface;
     var Node = scope.wrappers.Node;
     var ParentNodeInterface = scope.ParentNodeInterface;
+    var NonElementParentNodeInterface = scope.NonElementParentNodeInterface;
     var Selection = scope.wrappers.Selection;
     var SelectorsInterface = scope.SelectorsInterface;
     var ShadowRoot = scope.wrappers.ShadowRoot;
     var TreeScope = scope.TreeScope;
     var cloneNode = scope.cloneNode;
+    var defineGetter = scope.defineGetter;
     var defineWrapGetter = scope.defineWrapGetter;
     var elementFromPoint = scope.elementFromPoint;
     var forwardMethodsToWrapper = scope.forwardMethodsToWrapper;
@@ -3906,13 +4113,29 @@ if (WebComponents.flags.shadow) {
     defineWrapGetter(Document, "documentElement");
     defineWrapGetter(Document, "body");
     defineWrapGetter(Document, "head");
+    defineGetter(Document, "activeElement", function() {
+      var unwrappedActiveElement = unwrap(this).activeElement;
+      if (!unwrappedActiveElement || !unwrappedActiveElement.nodeType) return null;
+      var activeElement = wrap(unwrappedActiveElement);
+      while (!this.contains(activeElement)) {
+        while (activeElement.parentNode) {
+          activeElement = activeElement.parentNode;
+        }
+        if (activeElement.host) {
+          activeElement = activeElement.host;
+        } else {
+          return null;
+        }
+      }
+      return activeElement;
+    });
     function wrapMethod(name) {
       var original = document[name];
       Document.prototype[name] = function() {
         return wrap(original.apply(unsafeUnwrap(this), arguments));
       };
     }
-    [ "createComment", "createDocumentFragment", "createElement", "createElementNS", "createEvent", "createEventNS", "createRange", "createTextNode", "getElementById" ].forEach(wrapMethod);
+    [ "createComment", "createDocumentFragment", "createElement", "createElementNS", "createEvent", "createEventNS", "createRange", "createTextNode" ].forEach(wrapMethod);
     var originalAdoptNode = document.adoptNode;
     function adoptNodeNoRemove(node, doc) {
       originalAdoptNode.call(unsafeUnwrap(doc), unwrap(node));
@@ -3950,11 +4173,30 @@ if (WebComponents.flags.shadow) {
         return SelectorsInterface.querySelectorAll.call(this, "[name=" + JSON.stringify(String(name)) + "]");
       }
     });
-    if (document.registerElement) {
-      var originalRegisterElement = document.registerElement;
-      Document.prototype.registerElement = function(tagName, object) {
-        var prototype, extendsOption;
-        if (object !== undefined) {
+    var originalCreateTreeWalker = document.createTreeWalker;
+    var TreeWalkerWrapper = scope.wrappers.TreeWalker;
+    Document.prototype.createTreeWalker = function(root, whatToShow, filter, expandEntityReferences) {
+      var newFilter = null;
+      if (filter) {
+        if (filter.acceptNode && typeof filter.acceptNode === "function") {
+          newFilter = {
+            acceptNode: function(node) {
+              return filter.acceptNode(wrap(node));
+            }
+          };
+        } else if (typeof filter === "function") {
+          newFilter = function(node) {
+            return filter(wrap(node));
+          };
+        }
+      }
+      return new TreeWalkerWrapper(originalCreateTreeWalker.call(unwrap(this), unwrap(root), whatToShow, newFilter, expandEntityReferences));
+    };
+    if (document.registerElement) {
+      var originalRegisterElement = document.registerElement;
+      Document.prototype.registerElement = function(tagName, object) {
+        var prototype, extendsOption;
+        if (object !== undefined) {
           prototype = object.prototype;
           extendsOption = object.extends;
         }
@@ -4011,11 +4253,13 @@ if (WebComponents.flags.shadow) {
       };
       forwardMethodsToWrapper([ window.HTMLDocument || window.Document ], [ "registerElement" ]);
     }
-    forwardMethodsToWrapper([ window.HTMLBodyElement, window.HTMLDocument || window.Document, window.HTMLHeadElement, window.HTMLHtmlElement ], [ "appendChild", "compareDocumentPosition", "contains", "getElementsByClassName", "getElementsByTagName", "getElementsByTagNameNS", "insertBefore", "querySelector", "querySelectorAll", "removeChild", "replaceChild" ].concat(matchesNames));
-    forwardMethodsToWrapper([ window.HTMLDocument || window.Document ], [ "adoptNode", "importNode", "contains", "createComment", "createDocumentFragment", "createElement", "createElementNS", "createEvent", "createEventNS", "createRange", "createTextNode", "elementFromPoint", "getElementById", "getElementsByName", "getSelection" ]);
+    forwardMethodsToWrapper([ window.HTMLBodyElement, window.HTMLDocument || window.Document, window.HTMLHeadElement, window.HTMLHtmlElement ], [ "appendChild", "compareDocumentPosition", "contains", "getElementsByClassName", "getElementsByTagName", "getElementsByTagNameNS", "insertBefore", "querySelector", "querySelectorAll", "removeChild", "replaceChild" ]);
+    forwardMethodsToWrapper([ window.HTMLBodyElement, window.HTMLHeadElement, window.HTMLHtmlElement ], matchesNames);
+    forwardMethodsToWrapper([ window.HTMLDocument || window.Document ], [ "adoptNode", "importNode", "contains", "createComment", "createDocumentFragment", "createElement", "createElementNS", "createEvent", "createEventNS", "createRange", "createTextNode", "createTreeWalker", "elementFromPoint", "getElementById", "getElementsByName", "getSelection" ]);
     mixin(Document.prototype, GetElementsByInterface);
     mixin(Document.prototype, ParentNodeInterface);
     mixin(Document.prototype, SelectorsInterface);
+    mixin(Document.prototype, NonElementParentNodeInterface);
     mixin(Document.prototype, {
       get implementation() {
         var implementation = implementationTable.get(this);
@@ -4034,6 +4278,11 @@ if (WebComponents.flags.shadow) {
     function DOMImplementation(impl) {
       setWrapper(impl, this);
     }
+    var originalCreateDocument = document.implementation.createDocument;
+    DOMImplementation.prototype.createDocument = function() {
+      arguments[2] = unwrap(arguments[2]);
+      return wrap(originalCreateDocument.apply(unsafeUnwrap(this), arguments));
+    };
     function wrapImplMethod(constructor, name) {
       var original = document.implementation[name];
       constructor.prototype[name] = function() {
@@ -4047,11 +4296,10 @@ if (WebComponents.flags.shadow) {
       };
     }
     wrapImplMethod(DOMImplementation, "createDocumentType");
-    wrapImplMethod(DOMImplementation, "createDocument");
     wrapImplMethod(DOMImplementation, "createHTMLDocument");
     forwardImplMethod(DOMImplementation, "hasFeature");
     registerWrapper(window.DOMImplementation, DOMImplementation);
-    forwardMethodsToWrapper([ window.DOMImplementation ], [ "createDocumentType", "createDocument", "createHTMLDocument", "hasFeature" ]);
+    forwardMethodsToWrapper([ window.DOMImplementation ], [ "createDocument", "createDocumentType", "createHTMLDocument", "hasFeature" ]);
     scope.adoptNodeNoRemove = adoptNodeNoRemove;
     scope.wrappers.DOMImplementation = DOMImplementation;
     scope.wrappers.Document = Document;
@@ -4456,7 +4704,7 @@ if (WebComponents.flags.shadow) {
         return !selector.match(re);
       },
       makeScopeMatcher: function(scopeSelector) {
-        scopeSelector = scopeSelector.replace(/\[/g, "\\[").replace(/\[/g, "\\]");
+        scopeSelector = scopeSelector.replace(/\[/g, "\\[").replace(/\]/g, "\\]");
         return new RegExp("^(" + scopeSelector + ")" + selectorReSuffix, "m");
       },
       applySelectorScope: function(selector, selectorScope) {
@@ -4526,8 +4774,8 @@ if (WebComponents.flags.shadow) {
         }
       }
     };
-    var selectorRe = /([^{]*)({[\s\S]*?})/gim, cssCommentRe = /\/\*[^*]*\*+([^/*][^*]*\*+)*\//gim, cssCommentNextSelectorRe = /\/\*\s*@polyfill ([^*]*\*+([^/*][^*]*\*+)*\/)([^{]*?){/gim, cssContentNextSelectorRe = /polyfill-next-selector[^}]*content\:[\s]*?['"](.*?)['"][;\s]*}([^{]*?){/gim, cssCommentRuleRe = /\/\*\s@polyfill-rule([^*]*\*+([^/*][^*]*\*+)*)\//gim, cssContentRuleRe = /(polyfill-rule)[^}]*(content\:[\s]*['"](.*?)['"])[;\s]*[^}]*}/gim, cssCommentUnscopedRuleRe = /\/\*\s@polyfill-unscoped-rule([^*]*\*+([^/*][^*]*\*+)*)\//gim, cssContentUnscopedRuleRe = /(polyfill-unscoped-rule)[^}]*(content\:[\s]*['"](.*?)['"])[;\s]*[^}]*}/gim, cssPseudoRe = /::(x-[^\s{,(]*)/gim, cssPartRe = /::part\(([^)]*)\)/gim, polyfillHost = "-shadowcsshost", polyfillHostContext = "-shadowcsscontext", parenSuffix = ")(?:\\((" + "(?:\\([^)(]*\\)|[^)(]*)+?" + ")\\))?([^,{]*)";
-    var cssColonHostRe = new RegExp("(" + polyfillHost + parenSuffix, "gim"), cssColonHostContextRe = new RegExp("(" + polyfillHostContext + parenSuffix, "gim"), selectorReSuffix = "([>\\s~+[.,{:][\\s\\S]*)?$", colonHostRe = /\:host/gim, colonHostContextRe = /\:host-context/gim, polyfillHostNoCombinator = polyfillHost + "-no-combinator", polyfillHostRe = new RegExp(polyfillHost, "gim"), polyfillHostContextRe = new RegExp(polyfillHostContext, "gim"), shadowDOMSelectorsRe = [ /\^\^/g, /\^/g, /\/shadow\//g, /\/shadow-deep\//g, /::shadow/g, /\/deep\//g, /::content/g ];
+    var selectorRe = /([^{]*)({[\s\S]*?})/gim, cssCommentRe = /\/\*[^*]*\*+([^\/*][^*]*\*+)*\//gim, cssCommentNextSelectorRe = /\/\*\s*@polyfill ([^*]*\*+([^\/*][^*]*\*+)*\/)([^{]*?){/gim, cssContentNextSelectorRe = /polyfill-next-selector[^}]*content\:[\s]*?['"](.*?)['"][;\s]*}([^{]*?){/gim, cssCommentRuleRe = /\/\*\s@polyfill-rule([^*]*\*+([^\/*][^*]*\*+)*)\//gim, cssContentRuleRe = /(polyfill-rule)[^}]*(content\:[\s]*['"](.*?)['"])[;\s]*[^}]*}/gim, cssCommentUnscopedRuleRe = /\/\*\s@polyfill-unscoped-rule([^*]*\*+([^\/*][^*]*\*+)*)\//gim, cssContentUnscopedRuleRe = /(polyfill-unscoped-rule)[^}]*(content\:[\s]*['"](.*?)['"])[;\s]*[^}]*}/gim, cssPseudoRe = /::(x-[^\s{,(]*)/gim, cssPartRe = /::part\(([^)]*)\)/gim, polyfillHost = "-shadowcsshost", polyfillHostContext = "-shadowcsscontext", parenSuffix = ")(?:\\((" + "(?:\\([^)(]*\\)|[^)(]*)+?" + ")\\))?([^,{]*)";
+    var cssColonHostRe = new RegExp("(" + polyfillHost + parenSuffix, "gim"), cssColonHostContextRe = new RegExp("(" + polyfillHostContext + parenSuffix, "gim"), selectorReSuffix = "([>\\s~+[.,{:][\\s\\S]*)?$", colonHostRe = /\:host/gim, colonHostContextRe = /\:host-context/gim, polyfillHostNoCombinator = polyfillHost + "-no-combinator", polyfillHostRe = new RegExp(polyfillHost, "gim"), polyfillHostContextRe = new RegExp(polyfillHostContext, "gim"), shadowDOMSelectorsRe = [ />>>/g, /::shadow/g, /::content/g, /\/deep\//g, /\/shadow\//g, /\/shadow-deep\//g, /\^\^/g, /\^/g ];
     function stylesToCssText(styles, preserveComments) {
       var cssText = "";
       Array.prototype.forEach.call(styles, function(s) {
@@ -4649,7 +4897,7 @@ if (WebComponents.flags.shadow) {
               style = elt.ownerDocument.createElement("style");
               style.textContent = elt.__resource;
             }
-            HTMLImports.path.resolveUrlsInStyle(style);
+            HTMLImports.path.resolveUrlsInStyle(style, elt.href);
             style.textContent = ShadowCSS.shimStyle(style);
             style.removeAttribute(SHIM_ATTRIBUTE, "");
             style.setAttribute(SHIMMED_ATTRIBUTE, "");
@@ -4691,10 +4939,535 @@ if (WebComponents.flags.shadow) {
   }
 })(window.WebComponents);
 
+(function(scope) {
+  "use strict";
+  var hasWorkingUrl = false;
+  if (!scope.forceJURL) {
+    try {
+      var u = new URL("b", "http://a");
+      u.pathname = "c%20d";
+      hasWorkingUrl = u.href === "http://a/c%20d";
+    } catch (e) {}
+  }
+  if (hasWorkingUrl) return;
+  var relative = Object.create(null);
+  relative["ftp"] = 21;
+  relative["file"] = 0;
+  relative["gopher"] = 70;
+  relative["http"] = 80;
+  relative["https"] = 443;
+  relative["ws"] = 80;
+  relative["wss"] = 443;
+  var relativePathDotMapping = Object.create(null);
+  relativePathDotMapping["%2e"] = ".";
+  relativePathDotMapping[".%2e"] = "..";
+  relativePathDotMapping["%2e."] = "..";
+  relativePathDotMapping["%2e%2e"] = "..";
+  function isRelativeScheme(scheme) {
+    return relative[scheme] !== undefined;
+  }
+  function invalid() {
+    clear.call(this);
+    this._isInvalid = true;
+  }
+  function IDNAToASCII(h) {
+    if ("" == h) {
+      invalid.call(this);
+    }
+    return h.toLowerCase();
+  }
+  function percentEscape(c) {
+    var unicode = c.charCodeAt(0);
+    if (unicode > 32 && unicode < 127 && [ 34, 35, 60, 62, 63, 96 ].indexOf(unicode) == -1) {
+      return c;
+    }
+    return encodeURIComponent(c);
+  }
+  function percentEscapeQuery(c) {
+    var unicode = c.charCodeAt(0);
+    if (unicode > 32 && unicode < 127 && [ 34, 35, 60, 62, 96 ].indexOf(unicode) == -1) {
+      return c;
+    }
+    return encodeURIComponent(c);
+  }
+  var EOF = undefined, ALPHA = /[a-zA-Z]/, ALPHANUMERIC = /[a-zA-Z0-9\+\-\.]/;
+  function parse(input, stateOverride, base) {
+    function err(message) {
+      errors.push(message);
+    }
+    var state = stateOverride || "scheme start", cursor = 0, buffer = "", seenAt = false, seenBracket = false, errors = [];
+    loop: while ((input[cursor - 1] != EOF || cursor == 0) && !this._isInvalid) {
+      var c = input[cursor];
+      switch (state) {
+       case "scheme start":
+        if (c && ALPHA.test(c)) {
+          buffer += c.toLowerCase();
+          state = "scheme";
+        } else if (!stateOverride) {
+          buffer = "";
+          state = "no scheme";
+          continue;
+        } else {
+          err("Invalid scheme.");
+          break loop;
+        }
+        break;
+
+       case "scheme":
+        if (c && ALPHANUMERIC.test(c)) {
+          buffer += c.toLowerCase();
+        } else if (":" == c) {
+          this._scheme = buffer;
+          buffer = "";
+          if (stateOverride) {
+            break loop;
+          }
+          if (isRelativeScheme(this._scheme)) {
+            this._isRelative = true;
+          }
+          if ("file" == this._scheme) {
+            state = "relative";
+          } else if (this._isRelative && base && base._scheme == this._scheme) {
+            state = "relative or authority";
+          } else if (this._isRelative) {
+            state = "authority first slash";
+          } else {
+            state = "scheme data";
+          }
+        } else if (!stateOverride) {
+          buffer = "";
+          cursor = 0;
+          state = "no scheme";
+          continue;
+        } else if (EOF == c) {
+          break loop;
+        } else {
+          err("Code point not allowed in scheme: " + c);
+          break loop;
+        }
+        break;
+
+       case "scheme data":
+        if ("?" == c) {
+          this._query = "?";
+          state = "query";
+        } else if ("#" == c) {
+          this._fragment = "#";
+          state = "fragment";
+        } else {
+          if (EOF != c && "	" != c && "\n" != c && "\r" != c) {
+            this._schemeData += percentEscape(c);
+          }
+        }
+        break;
+
+       case "no scheme":
+        if (!base || !isRelativeScheme(base._scheme)) {
+          err("Missing scheme.");
+          invalid.call(this);
+        } else {
+          state = "relative";
+          continue;
+        }
+        break;
+
+       case "relative or authority":
+        if ("/" == c && "/" == input[cursor + 1]) {
+          state = "authority ignore slashes";
+        } else {
+          err("Expected /, got: " + c);
+          state = "relative";
+          continue;
+        }
+        break;
+
+       case "relative":
+        this._isRelative = true;
+        if ("file" != this._scheme) this._scheme = base._scheme;
+        if (EOF == c) {
+          this._host = base._host;
+          this._port = base._port;
+          this._path = base._path.slice();
+          this._query = base._query;
+          this._username = base._username;
+          this._password = base._password;
+          break loop;
+        } else if ("/" == c || "\\" == c) {
+          if ("\\" == c) err("\\ is an invalid code point.");
+          state = "relative slash";
+        } else if ("?" == c) {
+          this._host = base._host;
+          this._port = base._port;
+          this._path = base._path.slice();
+          this._query = "?";
+          this._username = base._username;
+          this._password = base._password;
+          state = "query";
+        } else if ("#" == c) {
+          this._host = base._host;
+          this._port = base._port;
+          this._path = base._path.slice();
+          this._query = base._query;
+          this._fragment = "#";
+          this._username = base._username;
+          this._password = base._password;
+          state = "fragment";
+        } else {
+          var nextC = input[cursor + 1];
+          var nextNextC = input[cursor + 2];
+          if ("file" != this._scheme || !ALPHA.test(c) || nextC != ":" && nextC != "|" || EOF != nextNextC && "/" != nextNextC && "\\" != nextNextC && "?" != nextNextC && "#" != nextNextC) {
+            this._host = base._host;
+            this._port = base._port;
+            this._username = base._username;
+            this._password = base._password;
+            this._path = base._path.slice();
+            this._path.pop();
+          }
+          state = "relative path";
+          continue;
+        }
+        break;
+
+       case "relative slash":
+        if ("/" == c || "\\" == c) {
+          if ("\\" == c) {
+            err("\\ is an invalid code point.");
+          }
+          if ("file" == this._scheme) {
+            state = "file host";
+          } else {
+            state = "authority ignore slashes";
+          }
+        } else {
+          if ("file" != this._scheme) {
+            this._host = base._host;
+            this._port = base._port;
+            this._username = base._username;
+            this._password = base._password;
+          }
+          state = "relative path";
+          continue;
+        }
+        break;
+
+       case "authority first slash":
+        if ("/" == c) {
+          state = "authority second slash";
+        } else {
+          err("Expected '/', got: " + c);
+          state = "authority ignore slashes";
+          continue;
+        }
+        break;
+
+       case "authority second slash":
+        state = "authority ignore slashes";
+        if ("/" != c) {
+          err("Expected '/', got: " + c);
+          continue;
+        }
+        break;
+
+       case "authority ignore slashes":
+        if ("/" != c && "\\" != c) {
+          state = "authority";
+          continue;
+        } else {
+          err("Expected authority, got: " + c);
+        }
+        break;
+
+       case "authority":
+        if ("@" == c) {
+          if (seenAt) {
+            err("@ already seen.");
+            buffer += "%40";
+          }
+          seenAt = true;
+          for (var i = 0; i < buffer.length; i++) {
+            var cp = buffer[i];
+            if ("	" == cp || "\n" == cp || "\r" == cp) {
+              err("Invalid whitespace in authority.");
+              continue;
+            }
+            if (":" == cp && null === this._password) {
+              this._password = "";
+              continue;
+            }
+            var tempC = percentEscape(cp);
+            null !== this._password ? this._password += tempC : this._username += tempC;
+          }
+          buffer = "";
+        } else if (EOF == c || "/" == c || "\\" == c || "?" == c || "#" == c) {
+          cursor -= buffer.length;
+          buffer = "";
+          state = "host";
+          continue;
+        } else {
+          buffer += c;
+        }
+        break;
+
+       case "file host":
+        if (EOF == c || "/" == c || "\\" == c || "?" == c || "#" == c) {
+          if (buffer.length == 2 && ALPHA.test(buffer[0]) && (buffer[1] == ":" || buffer[1] == "|")) {
+            state = "relative path";
+          } else if (buffer.length == 0) {
+            state = "relative path start";
+          } else {
+            this._host = IDNAToASCII.call(this, buffer);
+            buffer = "";
+            state = "relative path start";
+          }
+          continue;
+        } else if ("	" == c || "\n" == c || "\r" == c) {
+          err("Invalid whitespace in file host.");
+        } else {
+          buffer += c;
+        }
+        break;
+
+       case "host":
+       case "hostname":
+        if (":" == c && !seenBracket) {
+          this._host = IDNAToASCII.call(this, buffer);
+          buffer = "";
+          state = "port";
+          if ("hostname" == stateOverride) {
+            break loop;
+          }
+        } else if (EOF == c || "/" == c || "\\" == c || "?" == c || "#" == c) {
+          this._host = IDNAToASCII.call(this, buffer);
+          buffer = "";
+          state = "relative path start";
+          if (stateOverride) {
+            break loop;
+          }
+          continue;
+        } else if ("	" != c && "\n" != c && "\r" != c) {
+          if ("[" == c) {
+            seenBracket = true;
+          } else if ("]" == c) {
+            seenBracket = false;
+          }
+          buffer += c;
+        } else {
+          err("Invalid code point in host/hostname: " + c);
+        }
+        break;
+
+       case "port":
+        if (/[0-9]/.test(c)) {
+          buffer += c;
+        } else if (EOF == c || "/" == c || "\\" == c || "?" == c || "#" == c || stateOverride) {
+          if ("" != buffer) {
+            var temp = parseInt(buffer, 10);
+            if (temp != relative[this._scheme]) {
+              this._port = temp + "";
+            }
+            buffer = "";
+          }
+          if (stateOverride) {
+            break loop;
+          }
+          state = "relative path start";
+          continue;
+        } else if ("	" == c || "\n" == c || "\r" == c) {
+          err("Invalid code point in port: " + c);
+        } else {
+          invalid.call(this);
+        }
+        break;
+
+       case "relative path start":
+        if ("\\" == c) err("'\\' not allowed in path.");
+        state = "relative path";
+        if ("/" != c && "\\" != c) {
+          continue;
+        }
+        break;
+
+       case "relative path":
+        if (EOF == c || "/" == c || "\\" == c || !stateOverride && ("?" == c || "#" == c)) {
+          if ("\\" == c) {
+            err("\\ not allowed in relative path.");
+          }
+          var tmp;
+          if (tmp = relativePathDotMapping[buffer.toLowerCase()]) {
+            buffer = tmp;
+          }
+          if (".." == buffer) {
+            this._path.pop();
+            if ("/" != c && "\\" != c) {
+              this._path.push("");
+            }
+          } else if ("." == buffer && "/" != c && "\\" != c) {
+            this._path.push("");
+          } else if ("." != buffer) {
+            if ("file" == this._scheme && this._path.length == 0 && buffer.length == 2 && ALPHA.test(buffer[0]) && buffer[1] == "|") {
+              buffer = buffer[0] + ":";
+            }
+            this._path.push(buffer);
+          }
+          buffer = "";
+          if ("?" == c) {
+            this._query = "?";
+            state = "query";
+          } else if ("#" == c) {
+            this._fragment = "#";
+            state = "fragment";
+          }
+        } else if ("	" != c && "\n" != c && "\r" != c) {
+          buffer += percentEscape(c);
+        }
+        break;
+
+       case "query":
+        if (!stateOverride && "#" == c) {
+          this._fragment = "#";
+          state = "fragment";
+        } else if (EOF != c && "	" != c && "\n" != c && "\r" != c) {
+          this._query += percentEscapeQuery(c);
+        }
+        break;
+
+       case "fragment":
+        if (EOF != c && "	" != c && "\n" != c && "\r" != c) {
+          this._fragment += c;
+        }
+        break;
+      }
+      cursor++;
+    }
+  }
+  function clear() {
+    this._scheme = "";
+    this._schemeData = "";
+    this._username = "";
+    this._password = null;
+    this._host = "";
+    this._port = "";
+    this._path = [];
+    this._query = "";
+    this._fragment = "";
+    this._isInvalid = false;
+    this._isRelative = false;
+  }
+  function jURL(url, base) {
+    if (base !== undefined && !(base instanceof jURL)) base = new jURL(String(base));
+    this._url = url;
+    clear.call(this);
+    var input = url.replace(/^[ \t\r\n\f]+|[ \t\r\n\f]+$/g, "");
+    parse.call(this, input, null, base);
+  }
+  jURL.prototype = {
+    toString: function() {
+      return this.href;
+    },
+    get href() {
+      if (this._isInvalid) return this._url;
+      var authority = "";
+      if ("" != this._username || null != this._password) {
+        authority = this._username + (null != this._password ? ":" + this._password : "") + "@";
+      }
+      return this.protocol + (this._isRelative ? "//" + authority + this.host : "") + this.pathname + this._query + this._fragment;
+    },
+    set href(href) {
+      clear.call(this);
+      parse.call(this, href);
+    },
+    get protocol() {
+      return this._scheme + ":";
+    },
+    set protocol(protocol) {
+      if (this._isInvalid) return;
+      parse.call(this, protocol + ":", "scheme start");
+    },
+    get host() {
+      return this._isInvalid ? "" : this._port ? this._host + ":" + this._port : this._host;
+    },
+    set host(host) {
+      if (this._isInvalid || !this._isRelative) return;
+      parse.call(this, host, "host");
+    },
+    get hostname() {
+      return this._host;
+    },
+    set hostname(hostname) {
+      if (this._isInvalid || !this._isRelative) return;
+      parse.call(this, hostname, "hostname");
+    },
+    get port() {
+      return this._port;
+    },
+    set port(port) {
+      if (this._isInvalid || !this._isRelative) return;
+      parse.call(this, port, "port");
+    },
+    get pathname() {
+      return this._isInvalid ? "" : this._isRelative ? "/" + this._path.join("/") : this._schemeData;
+    },
+    set pathname(pathname) {
+      if (this._isInvalid || !this._isRelative) return;
+      this._path = [];
+      parse.call(this, pathname, "relative path start");
+    },
+    get search() {
+      return this._isInvalid || !this._query || "?" == this._query ? "" : this._query;
+    },
+    set search(search) {
+      if (this._isInvalid || !this._isRelative) return;
+      this._query = "?";
+      if ("?" == search[0]) search = search.slice(1);
+      parse.call(this, search, "query");
+    },
+    get hash() {
+      return this._isInvalid || !this._fragment || "#" == this._fragment ? "" : this._fragment;
+    },
+    set hash(hash) {
+      if (this._isInvalid) return;
+      this._fragment = "#";
+      if ("#" == hash[0]) hash = hash.slice(1);
+      parse.call(this, hash, "fragment");
+    },
+    get origin() {
+      var host;
+      if (this._isInvalid || !this._scheme) {
+        return "";
+      }
+      switch (this._scheme) {
+       case "data":
+       case "file":
+       case "javascript":
+       case "mailto":
+        return "null";
+      }
+      host = this.host;
+      if (!host) {
+        return "";
+      }
+      return this._scheme + "://" + host;
+    }
+  };
+  var OriginalURL = scope.URL;
+  if (OriginalURL) {
+    jURL.createObjectURL = function(blob) {
+      return OriginalURL.createObjectURL.apply(OriginalURL, arguments);
+    };
+    jURL.revokeObjectURL = function(url) {
+      OriginalURL.revokeObjectURL(url);
+    };
+  }
+  scope.URL = jURL;
+})(self);
+
 (function(global) {
+  if (global.JsMutationObserver) {
+    return;
+  }
   var registrationsTable = new WeakMap();
   var setImmediate;
-  if (/Trident/.test(navigator.userAgent)) {
+  if (/Trident|Edge/.test(navigator.userAgent)) {
     setImmediate = setTimeout;
   } else if (window.setImmediate) {
     setImmediate = window.setImmediate;
@@ -4962,7 +5735,6 @@ if (WebComponents.flags.shadow) {
         this.addTransientObserver(e.target);
 
        case "DOMNodeInserted":
-        var target = e.relatedNode;
         var changedNode = e.target;
         var addedNodes, removedNodes;
         if (e.type === "DOMNodeInserted") {
@@ -4974,12 +5746,12 @@ if (WebComponents.flags.shadow) {
         }
         var previousSibling = changedNode.previousSibling;
         var nextSibling = changedNode.nextSibling;
-        var record = getRecord("childList", target);
+        var record = getRecord("childList", e.target.parentNode);
         record.addedNodes = addedNodes;
         record.removedNodes = removedNodes;
         record.previousSibling = previousSibling;
         record.nextSibling = nextSibling;
-        forEachAncestorAndObserverEnqueueRecord(target, function(options) {
+        forEachAncestorAndObserverEnqueueRecord(e.relatedNode, function(options) {
           if (!options.childList) return;
           return record;
         });
@@ -4988,8 +5760,83 @@ if (WebComponents.flags.shadow) {
     }
   };
   global.JsMutationObserver = JsMutationObserver;
-  if (!global.MutationObserver) global.MutationObserver = JsMutationObserver;
-})(this);
+  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);
 
 window.HTMLImports = window.HTMLImports || {
   flags: {}
@@ -5000,12 +5847,12 @@ window.HTMLImports = window.HTMLImports || {
   var useNative = Boolean(IMPORT_LINK_TYPE in document.createElement("link"));
   var hasShadowDOMPolyfill = Boolean(window.ShadowDOMPolyfill);
   var wrap = function(node) {
-    return hasShadowDOMPolyfill ? ShadowDOMPolyfill.wrapIfNeeded(node) : node;
+    return hasShadowDOMPolyfill ? window.ShadowDOMPolyfill.wrapIfNeeded(node) : node;
   };
   var rootDocument = wrap(document);
   var currentScriptDescriptor = {
     get: function() {
-      var script = HTMLImports.currentScript || document.currentScript || (document.readyState !== "complete" ? document.scripts[document.scripts.length - 1] : null);
+      var script = window.HTMLImports.currentScript || document.currentScript || (document.readyState !== "complete" ? document.scripts[document.scripts.length - 1] : null);
       return wrap(script);
     },
     configurable: true
@@ -5042,26 +5889,36 @@ window.HTMLImports = window.HTMLImports || {
   }
   function watchImportsLoad(callback, doc) {
     var imports = doc.querySelectorAll("link[rel=import]");
-    var loaded = 0, l = imports.length;
-    function checkDone(d) {
-      if (loaded == l && callback) {
-        callback();
+    var parsedCount = 0, importCount = imports.length, newImports = [], errorImports = [];
+    function checkDone() {
+      if (parsedCount == importCount && callback) {
+        callback({
+          allImports: imports,
+          loadedImports: newImports,
+          errorImports: errorImports
+        });
       }
     }
     function loadedImport(e) {
       markTargetLoaded(e);
-      loaded++;
+      newImports.push(this);
+      parsedCount++;
+      checkDone();
+    }
+    function errorLoadingImport(e) {
+      errorImports.push(this);
+      parsedCount++;
       checkDone();
     }
-    if (l) {
-      for (var i = 0, imp; i < l && (imp = imports[i]); i++) {
+    if (importCount) {
+      for (var i = 0, imp; i < importCount && (imp = imports[i]); i++) {
         if (isImportLoaded(imp)) {
-          loadedImport.call(imp, {
-            target: imp
-          });
+          newImports.push(this);
+          parsedCount++;
+          checkDone();
         } else {
           imp.addEventListener("load", loadedImport);
-          imp.addEventListener("error", loadedImport);
+          imp.addEventListener("error", errorLoadingImport);
         }
       }
     } else {
@@ -5111,19 +5968,19 @@ window.HTMLImports = window.HTMLImports || {
       }
     })();
   }
-  whenReady(function() {
-    HTMLImports.ready = true;
-    HTMLImports.readyTime = new Date().getTime();
-    rootDocument.dispatchEvent(new CustomEvent("HTMLImportsLoaded", {
-      bubbles: true
-    }));
+  whenReady(function(detail) {
+    window.HTMLImports.ready = true;
+    window.HTMLImports.readyTime = new Date().getTime();
+    var evt = rootDocument.createEvent("CustomEvent");
+    evt.initCustomEvent("HTMLImportsLoaded", true, true, detail);
+    rootDocument.dispatchEvent(evt);
   });
   scope.IMPORT_LINK_TYPE = IMPORT_LINK_TYPE;
   scope.useNative = useNative;
   scope.rootDocument = rootDocument;
   scope.whenReady = whenReady;
   scope.isIE = isIE;
-})(HTMLImports);
+})(window.HTMLImports);
 
 (function(scope) {
   var modules = [];
@@ -5137,26 +5994,29 @@ window.HTMLImports = window.HTMLImports || {
   };
   scope.addModule = addModule;
   scope.initializeModules = initializeModules;
-})(HTMLImports);
+})(window.HTMLImports);
 
-HTMLImports.addModule(function(scope) {
+window.HTMLImports.addModule(function(scope) {
   var CSS_URL_REGEXP = /(url\()([^)]*)(\))/g;
   var CSS_IMPORT_REGEXP = /(@import[\s]+(?!url\())([^;]*)(;)/g;
   var path = {
-    resolveUrlsInStyle: function(style) {
+    resolveUrlsInStyle: function(style, linkUrl) {
       var doc = style.ownerDocument;
       var resolver = doc.createElement("a");
-      style.textContent = this.resolveUrlsInCssText(style.textContent, resolver);
+      style.textContent = this.resolveUrlsInCssText(style.textContent, linkUrl, resolver);
       return style;
     },
-    resolveUrlsInCssText: function(cssText, urlObj) {
-      var r = this.replaceUrls(cssText, urlObj, CSS_URL_REGEXP);
-      r = this.replaceUrls(r, urlObj, CSS_IMPORT_REGEXP);
+    resolveUrlsInCssText: function(cssText, linkUrl, urlObj) {
+      var r = this.replaceUrls(cssText, urlObj, linkUrl, CSS_URL_REGEXP);
+      r = this.replaceUrls(r, urlObj, linkUrl, CSS_IMPORT_REGEXP);
       return r;
     },
-    replaceUrls: function(text, urlObj, regexp) {
+    replaceUrls: function(text, urlObj, linkUrl, regexp) {
       return text.replace(regexp, function(m, pre, url, post) {
         var urlPath = url.replace(/["']/g, "");
+        if (linkUrl) {
+          urlPath = new URL(urlPath, linkUrl).href;
+        }
         urlObj.href = urlPath;
         urlPath = urlObj.href;
         return pre + "'" + urlPath + "'" + post;
@@ -5166,8 +6026,8 @@ HTMLImports.addModule(function(scope) {
   scope.path = path;
 });
 
-HTMLImports.addModule(function(scope) {
-  xhr = {
+window.HTMLImports.addModule(function(scope) {
+  var xhr = {
     async: true,
     ok: function(request) {
       return request.status >= 200 && request.status < 300 || request.status === 304 || request.status === 0;
@@ -5180,10 +6040,14 @@ HTMLImports.addModule(function(scope) {
       request.open("GET", url, xhr.async);
       request.addEventListener("readystatechange", function(e) {
         if (request.readyState === 4) {
-          var locationHeader = request.getResponseHeader("Location");
           var redirectedUrl = null;
-          if (locationHeader) {
-            var redirectedUrl = locationHeader.substr(0, 1) === "/" ? location.origin + locationHeader : locationHeader;
+          try {
+            var locationHeader = request.getResponseHeader("Location");
+            if (locationHeader) {
+              redirectedUrl = locationHeader.substr(0, 1) === "/" ? location.origin + locationHeader : locationHeader;
+            }
+          } catch (e) {
+            console.error(e.message);
           }
           next.call(nextContext, !xhr.ok(request) && request, request.response || request.responseText, redirectedUrl);
         }
@@ -5198,7 +6062,7 @@ HTMLImports.addModule(function(scope) {
   scope.xhr = xhr;
 });
 
-HTMLImports.addModule(function(scope) {
+window.HTMLImports.addModule(function(scope) {
   var xhr = scope.xhr;
   var flags = scope.flags;
   var Loader = function(onLoad, onComplete) {
@@ -5244,7 +6108,13 @@ HTMLImports.addModule(function(scope) {
     },
     fetch: function(url, elt) {
       flags.load && console.log("fetch", url, elt);
-      if (url.match(/^data:/)) {
+      if (!url) {
+        setTimeout(function() {
+          this.receive(url, elt, {
+            error: "href must be specified"
+          }, null);
+        }.bind(this), 0);
+      } else if (url.match(/^data:/)) {
         var pieces = url.split(",");
         var header = pieces[0];
         var body = pieces[1];
@@ -5285,7 +6155,7 @@ HTMLImports.addModule(function(scope) {
   scope.Loader = Loader;
 });
 
-HTMLImports.addModule(function(scope) {
+window.HTMLImports.addModule(function(scope) {
   var Observer = function(addCallback) {
     this.addCallback = addCallback;
     this.mo = new MutationObserver(this.handler.bind(this));
@@ -5318,7 +6188,7 @@ HTMLImports.addModule(function(scope) {
   scope.Observer = Observer;
 });
 
-HTMLImports.addModule(function(scope) {
+window.HTMLImports.addModule(function(scope) {
   var path = scope.path;
   var rootDocument = scope.rootDocument;
   var flags = scope.flags;
@@ -5327,7 +6197,7 @@ HTMLImports.addModule(function(scope) {
   var IMPORT_SELECTOR = "link[rel=" + IMPORT_LINK_TYPE + "]";
   var importParser = {
     documentSelectors: IMPORT_SELECTOR,
-    importsSelectors: [ IMPORT_SELECTOR, "link[rel=stylesheet]", "style", "script:not([type])", 'script[type="text/javascript"]' ].join(","),
+    importsSelectors: [ IMPORT_SELECTOR, "link[rel=stylesheet]:not([type])", "style:not([type])", "script:not([type])", 'script[type="application/javascript"]', 'script[type="text/javascript"]' ].join(","),
     map: {
       link: "parseLink",
       script: "parseScript",
@@ -5378,8 +6248,9 @@ HTMLImports.addModule(function(scope) {
       }
     },
     parseImport: function(elt) {
-      if (HTMLImports.__importsParsingHook) {
-        HTMLImports.__importsParsingHook(elt);
+      elt.import = elt.__doc;
+      if (window.HTMLImports.__importsParsingHook) {
+        window.HTMLImports.__importsParsingHook(elt);
       }
       if (elt.import) {
         elt.import.__importParsed = true;
@@ -5418,6 +6289,7 @@ HTMLImports.addModule(function(scope) {
     parseStyle: function(elt) {
       var src = elt;
       elt = cloneStyle(elt);
+      src.__appliedElement = elt;
       elt.__importElement = src;
       this.parseGeneric(elt);
     },
@@ -5434,16 +6306,13 @@ HTMLImports.addModule(function(scope) {
     },
     addElementToDocument: function(elt) {
       var port = this.rootImportForElement(elt.__importElement || elt);
-      var l = port.__insertedElements = port.__insertedElements || 0;
-      var refNode = port.nextElementSibling;
-      for (var i = 0; i < l; i++) {
-        refNode = refNode && refNode.nextElementSibling;
-      }
-      port.parentNode.insertBefore(elt, refNode);
+      port.parentNode.insertBefore(elt, port);
     },
     trackElement: function(elt, callback) {
       var self = this;
       var done = function(e) {
+        elt.removeEventListener("load", done);
+        elt.removeEventListener("error", done);
         if (callback) {
           callback(e);
         }
@@ -5467,9 +6336,11 @@ HTMLImports.addModule(function(scope) {
           }
         }
         if (fakeLoad) {
-          elt.dispatchEvent(new CustomEvent("load", {
-            bubbles: false
-          }));
+          setTimeout(function() {
+            elt.dispatchEvent(new CustomEvent("load", {
+              bubbles: false
+            }));
+          });
         }
       }
     },
@@ -5479,7 +6350,9 @@ HTMLImports.addModule(function(scope) {
       script.src = scriptElt.src ? scriptElt.src : generateScriptDataUrl(scriptElt);
       scope.currentScript = scriptElt;
       this.trackElement(script, function(e) {
-        script.parentNode.removeChild(script);
+        if (script.parentNode) {
+          script.parentNode.removeChild(script);
+        }
         scope.currentScript = null;
       });
       this.addElementToDocument(script);
@@ -5492,10 +6365,10 @@ HTMLImports.addModule(function(scope) {
       if (doc && this._mayParse.indexOf(doc) < 0) {
         this._mayParse.push(doc);
         var nodes = doc.querySelectorAll(this.parseSelectorsForNode(doc));
-        for (var i = 0, l = nodes.length, p = 0, n; i < l && (n = nodes[i]); i++) {
+        for (var i = 0, l = nodes.length, n; i < l && (n = nodes[i]); i++) {
           if (!this.isParsed(n)) {
             if (this.hasResource(n)) {
-              return nodeIsImport(n) ? this.nextToParseInDoc(n.import, n) : n;
+              return nodeIsImport(n) ? this.nextToParseInDoc(n.__doc, n) : n;
             } else {
               return;
             }
@@ -5518,7 +6391,7 @@ HTMLImports.addModule(function(scope) {
       return this.dynamicElements.indexOf(elt) >= 0;
     },
     hasResource: function(node) {
-      if (nodeIsImport(node) && node.import === undefined) {
+      if (nodeIsImport(node) && node.__doc === undefined) {
         return false;
       }
       return true;
@@ -5552,7 +6425,7 @@ HTMLImports.addModule(function(scope) {
   scope.IMPORT_SELECTOR = IMPORT_SELECTOR;
 });
 
-HTMLImports.addModule(function(scope) {
+window.HTMLImports.addModule(function(scope) {
   var flags = scope.flags;
   var IMPORT_LINK_TYPE = scope.IMPORT_LINK_TYPE;
   var IMPORT_SELECTOR = scope.IMPORT_SELECTOR;
@@ -5592,7 +6465,7 @@ HTMLImports.addModule(function(scope) {
           }
           this.documents[url] = doc;
         }
-        elt.import = doc;
+        elt.__doc = doc;
       }
       parser.parseNext();
     },
@@ -5613,13 +6486,18 @@ HTMLImports.addModule(function(scope) {
   function isLinkRel(elt, rel) {
     return elt.localName === "link" && elt.getAttribute("rel") === rel;
   }
+  function hasBaseURIAccessor(doc) {
+    return !!Object.getOwnPropertyDescriptor(doc, "baseURI");
+  }
   function makeDocument(resource, url) {
     var doc = document.implementation.createHTMLDocument(IMPORT_LINK_TYPE);
     doc._URL = url;
     var base = doc.createElement("base");
     base.setAttribute("href", url);
-    if (!doc.baseURI) {
-      doc.baseURI = url;
+    if (!doc.baseURI && !hasBaseURIAccessor(doc)) {
+      Object.defineProperty(doc, "baseURI", {
+        value: url
+      });
     }
     var meta = doc.createElement("meta");
     meta.setAttribute("charset", "utf-8");
@@ -5646,12 +6524,12 @@ HTMLImports.addModule(function(scope) {
   scope.importLoader = importLoader;
 });
 
-HTMLImports.addModule(function(scope) {
+window.HTMLImports.addModule(function(scope) {
   var parser = scope.parser;
   var importer = scope.importer;
   var dynamic = {
     added: function(nodes) {
-      var owner, parsed;
+      var owner, parsed, loading;
       for (var i = 0, l = nodes.length, n; i < l && (n = nodes[i]); i++) {
         if (!owner) {
           owner = n.ownerDocument;
@@ -5678,28 +6556,22 @@ HTMLImports.addModule(function(scope) {
 });
 
 (function(scope) {
-  initializeModules = scope.initializeModules;
+  var initializeModules = scope.initializeModules;
+  var isIE = scope.isIE;
   if (scope.useNative) {
     return;
   }
-  if (typeof window.CustomEvent !== "function") {
-    window.CustomEvent = function(inType, dictionary) {
-      var e = document.createEvent("HTMLEvents");
-      e.initEvent(inType, dictionary.bubbles === false ? false : true, dictionary.cancelable === false ? false : true, dictionary.detail);
-      return e;
-    };
-  }
   initializeModules();
   var rootDocument = scope.rootDocument;
   function bootstrap() {
-    HTMLImports.importer.bootDocument(rootDocument);
+    window.HTMLImports.importer.bootDocument(rootDocument);
   }
   if (document.readyState === "complete" || document.readyState === "interactive" && !window.attachEvent) {
     bootstrap();
   } else {
     document.addEventListener("DOMContentLoaded", bootstrap);
   }
-})(HTMLImports);
+})(window.HTMLImports);
 
 window.CustomElements = window.CustomElements || {
   flags: {}
@@ -5719,11 +6591,12 @@ window.CustomElements = window.CustomElements || {
   scope.addModule = addModule;
   scope.initializeModules = initializeModules;
   scope.hasNative = Boolean(document.registerElement);
-  scope.useNative = !flags.register && scope.hasNative && !window.ShadowDOMPolyfill && (!window.HTMLImports || HTMLImports.useNative);
-})(CustomElements);
+  scope.isIE = /Trident/.test(navigator.userAgent);
+  scope.useNative = !flags.register && scope.hasNative && !window.ShadowDOMPolyfill && (!window.HTMLImports || window.HTMLImports.useNative);
+})(window.CustomElements);
 
-CustomElements.addModule(function(scope) {
-  var IMPORT_LINK_TYPE = window.HTMLImports ? HTMLImports.IMPORT_LINK_TYPE : "none";
+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)) {
@@ -5756,14 +6629,11 @@ CustomElements.addModule(function(scope) {
       root = root.olderShadowRoot;
     }
   }
-  var processingDocuments;
   function forDocumentTree(doc, cb) {
-    processingDocuments = [];
-    _forDocumentTree(doc, cb);
-    processingDocuments = null;
+    _forDocumentTree(doc, cb, []);
   }
-  function _forDocumentTree(doc, cb) {
-    doc = wrap(doc);
+  function _forDocumentTree(doc, cb, processingDocuments) {
+    doc = window.wrap(doc);
     if (processingDocuments.indexOf(doc) >= 0) {
       return;
     }
@@ -5771,7 +6641,7 @@ CustomElements.addModule(function(scope) {
     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);
+        _forDocumentTree(n.import, cb, processingDocuments);
       }
     }
     cb(doc);
@@ -5780,36 +6650,31 @@ CustomElements.addModule(function(scope) {
   scope.forSubtree = forSubtree;
 });
 
-CustomElements.addModule(function(scope) {
+window.CustomElements.addModule(function(scope) {
   var flags = scope.flags;
   var forSubtree = scope.forSubtree;
   var forDocumentTree = scope.forDocumentTree;
-  function addedNode(node) {
-    return added(node) || addedSubtree(node);
+  function addedNode(node, isAttached) {
+    return added(node, isAttached) || addedSubtree(node, isAttached);
   }
-  function added(node) {
-    if (scope.upgrade(node)) {
+  function added(node, isAttached) {
+    if (scope.upgrade(node, isAttached)) {
       return true;
     }
-    attached(node);
+    if (isAttached) {
+      attached(node);
+    }
   }
-  function addedSubtree(node) {
+  function addedSubtree(node, isAttached) {
     forSubtree(node, function(e) {
-      if (added(e)) {
+      if (added(e, isAttached)) {
         return true;
       }
     });
   }
-  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 hasThrottledAttached = window.MutationObserver._isPolyfilled && flags["throttle-attached"];
+  scope.hasPolyfillMutations = hasThrottledAttached;
+  scope.hasThrottledAttached = hasThrottledAttached;
   var isPendingMutations = false;
   var pendingMutations = [];
   function deferMutation(fn) {
@@ -5828,7 +6693,7 @@ CustomElements.addModule(function(scope) {
     pendingMutations = [];
   }
   function attached(element) {
-    if (hasPolyfillMutations) {
+    if (hasThrottledAttached) {
       deferMutation(function() {
         _attached(element);
       });
@@ -5837,12 +6702,10 @@ CustomElements.addModule(function(scope) {
     }
   }
   function _attached(element) {
-    if (element.__upgraded__ && (element.attachedCallback || element.detachedCallback)) {
-      if (!element.__attached && inDocument(element)) {
-        element.__attached = true;
-        if (element.attachedCallback) {
-          element.attachedCallback();
-        }
+    if (element.__upgraded__ && !element.__attached) {
+      element.__attached = true;
+      if (element.attachedCallback) {
+        element.attachedCallback();
       }
     }
   }
@@ -5853,7 +6716,7 @@ CustomElements.addModule(function(scope) {
     });
   }
   function detached(element) {
-    if (hasPolyfillMutations) {
+    if (hasThrottledAttached) {
       deferMutation(function() {
         _detached(element);
       });
@@ -5862,23 +6725,21 @@ CustomElements.addModule(function(scope) {
     }
   }
   function _detached(element) {
-    if (element.__upgraded__ && (element.attachedCallback || element.detachedCallback)) {
-      if (element.__attached && !inDocument(element)) {
-        element.__attached = false;
-        if (element.detachedCallback) {
-          element.detachedCallback();
-        }
+    if (element.__upgraded__ && element.__attached) {
+      element.__attached = false;
+      if (element.detachedCallback) {
+        element.detachedCallback();
       }
     }
   }
   function inDocument(element) {
     var p = element;
-    var doc = wrap(document);
+    var doc = window.wrap(document);
     while (p) {
       if (p == doc) {
         return true;
       }
-      p = p.parentNode || p.host;
+      p = p.parentNode || p.nodeType === Node.DOCUMENT_FRAGMENT_NODE && p.host;
     }
   }
   function watchShadow(node) {
@@ -5891,7 +6752,7 @@ CustomElements.addModule(function(scope) {
       }
     }
   }
-  function handler(mutations) {
+  function handler(root, mutations) {
     if (flags.dom) {
       var mx = mutations[0];
       if (mx && mx.type === "childList" && mx.addedNodes) {
@@ -5906,13 +6767,14 @@ CustomElements.addModule(function(scope) {
       }
       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);
+          addedNode(n, isAttached);
         });
         forEach(mx.removedNodes, function(n) {
           if (!n.localName) {
@@ -5925,16 +6787,16 @@ CustomElements.addModule(function(scope) {
     flags.dom && console.groupEnd();
   }
   function takeRecords(node) {
-    node = wrap(node);
+    node = window.wrap(node);
     if (!node) {
-      node = wrap(document);
+      node = window.wrap(document);
     }
     while (node.parentNode) {
       node = node.parentNode;
     }
     var observer = node.__observer;
     if (observer) {
-      handler(observer.takeRecords());
+      handler(node, observer.takeRecords());
       takeMutations();
     }
   }
@@ -5943,7 +6805,7 @@ CustomElements.addModule(function(scope) {
     if (inRoot.__observer) {
       return;
     }
-    var observer = new MutationObserver(handler);
+    var observer = new MutationObserver(handler.bind(this, inRoot));
     observer.observe(inRoot, {
       childList: true,
       subtree: true
@@ -5951,9 +6813,10 @@ CustomElements.addModule(function(scope) {
     inRoot.__observer = observer;
   }
   function upgradeDocument(doc) {
-    doc = wrap(doc);
+    doc = window.wrap(doc);
     flags.dom && console.group("upgradeDocument: ", doc.baseURI.split("/").pop());
-    addedNode(doc);
+    var isMainDocument = doc === window.wrap(document);
+    addedNode(doc, isMainDocument);
     observe(doc);
     flags.dom && console.groupEnd();
   }
@@ -5961,35 +6824,41 @@ CustomElements.addModule(function(scope) {
     forDocumentTree(doc, upgradeDocument);
   }
   var originalCreateShadowRoot = Element.prototype.createShadowRoot;
-  Element.prototype.createShadowRoot = function() {
-    var root = originalCreateShadowRoot.call(this);
-    CustomElements.watchShadow(this);
-    return root;
-  };
+  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.attachedNode = attachedNode;
+  scope.attached = attached;
   scope.takeRecords = takeRecords;
 });
 
-CustomElements.addModule(function(scope) {
+window.CustomElements.addModule(function(scope) {
   var flags = scope.flags;
-  function upgrade(node) {
+  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(is || node.localName);
+      var definition = scope.getRegisteredDefinition(node.localName) || scope.getRegisteredDefinition(is);
       if (definition) {
-        if (is && definition.tag == node.localName) {
-          return upgradeWithDefinition(node, definition);
-        } else if (!is && !definition.extends) {
-          return upgradeWithDefinition(node, definition);
+        if (is && definition.tag == node.localName || !is && !definition.extends) {
+          return upgradeWithDefinition(node, definition, isAttached);
         }
       }
     }
   }
-  function upgradeWithDefinition(element, definition) {
+  function upgradeWithDefinition(element, definition, isAttached) {
     flags.upgrade && console.group("upgrade:", element.localName);
     if (definition.is) {
       element.setAttribute("is", definition.is);
@@ -5997,8 +6866,10 @@ CustomElements.addModule(function(scope) {
     implementPrototype(element, definition);
     element.__upgraded__ = true;
     created(element);
-    scope.attachedNode(element);
-    scope.upgradeSubtree(element);
+    if (isAttached) {
+      scope.attached(element);
+    }
+    scope.upgradeSubtree(element, isAttached);
     flags.upgrade && console.groupEnd();
     return element;
   }
@@ -6034,9 +6905,10 @@ CustomElements.addModule(function(scope) {
   scope.implementPrototype = implementPrototype;
 });
 
-CustomElements.addModule(function(scope) {
+window.CustomElements.addModule(function(scope) {
+  var isIE = scope.isIE;
   var upgradeDocumentTree = scope.upgradeDocumentTree;
-  var upgrade = scope.upgrade;
+  var upgradeAll = scope.upgradeAll;
   var upgradeWithDefinition = scope.upgradeWithDefinition;
   var implementPrototype = scope.implementPrototype;
   var useNative = scope.useNative;
@@ -6125,17 +6997,23 @@ CustomElements.addModule(function(scope) {
       var nativePrototype = HTMLElement.prototype;
       if (definition.is) {
         var inst = document.createElement(definition.tag);
-        var expectedPrototype = Object.getPrototypeOf(inst);
-        if (expectedPrototype === definition.prototype) {
-          nativePrototype = expectedPrototype;
-        }
+        nativePrototype = Object.getPrototypeOf(inst);
       }
       var proto = definition.prototype, ancestor;
-      while (proto && proto !== nativePrototype) {
+      var foundPrototype = false;
+      while (proto) {
+        if (proto == nativePrototype) {
+          foundPrototype = true;
+        }
         ancestor = Object.getPrototypeOf(proto);
-        proto.__proto__ = ancestor;
+        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;
     }
   }
@@ -6165,6 +7043,12 @@ CustomElements.addModule(function(scope) {
     }
   }
   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) {
@@ -6186,17 +7070,14 @@ CustomElements.addModule(function(scope) {
     }
     return element;
   }
-  function cloneNode(deep) {
-    var n = domCloneNode.call(this, deep);
-    upgrade(n);
-    return n;
-  }
   var domCreateElement = document.createElement.bind(document);
   var domCreateElementNS = document.createElementNS.bind(document);
-  var domCloneNode = Node.prototype.cloneNode;
   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) {
@@ -6211,10 +7092,34 @@ CustomElements.addModule(function(scope) {
       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 (isIE) {
+    (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;
-  Node.prototype.cloneNode = cloneNode;
   scope.registry = registry;
   scope.instanceof = isInstance;
   scope.reservedTagList = reservedTagList;
@@ -6225,6 +7130,7 @@ CustomElements.addModule(function(scope) {
 (function(scope) {
   var useNative = scope.useNative;
   var initializeModules = scope.initializeModules;
+  var isIE = scope.isIE;
   if (useNative) {
     var nop = function() {};
     scope.watchShadow = nop;
@@ -6240,49 +7146,48 @@ CustomElements.addModule(function(scope) {
     initializeModules();
   }
   var upgradeDocumentTree = scope.upgradeDocumentTree;
+  var upgradeDocument = scope.upgradeDocument;
   if (!window.wrap) {
     if (window.ShadowDOMPolyfill) {
-      window.wrap = ShadowDOMPolyfill.wrapIfNeeded;
-      window.unwrap = ShadowDOMPolyfill.unwrapIfNeeded;
+      window.wrap = window.ShadowDOMPolyfill.wrapIfNeeded;
+      window.unwrap = window.ShadowDOMPolyfill.unwrapIfNeeded;
     } else {
       window.wrap = window.unwrap = function(node) {
         return node;
       };
     }
   }
-  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;
+  if (window.HTMLImports) {
+    window.HTMLImports.__importsParsingHook = function(elt) {
+      if (elt.import) {
+        upgradeDocument(wrap(elt.import));
       }
-      document.dispatchEvent(new CustomEvent("WebComponentsReady", {
-        bubbles: true
-      }));
-    });
+    };
   }
-  if (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);
     };
-    window.CustomEvent.prototype = window.Event.prototype;
+    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 && !HTMLImports.ready ? "HTMLImportsLoaded" : "DOMContentLoaded";
+    var loadEvent = window.HTMLImports && !window.HTMLImports.ready ? "HTMLImportsLoaded" : "DOMContentLoaded";
     window.addEventListener(loadEvent, bootstrap);
   }
 })(window.CustomElements);
@@ -6302,66 +7207,6 @@ CustomElements.addModule(function(scope) {
 })(window.WebComponents);
 
 (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 elementDeclarations = [];
-  var polymerStub = function(name, dictionary) {
-    if (typeof name !== "string" && arguments.length === 1) {
-      Array.prototype.push.call(arguments, document._currentScript);
-    }
-    elementDeclarations.push(arguments);
-  };
-  window.Polymer = polymerStub;
-  scope.consumeDeclarations = function(callback) {
-    scope.consumeDeclarations = function() {
-      throw "Possible attempt to load Polymer twice";
-    };
-    if (callback) {
-      callback(elementDeclarations);
-    }
-    elementDeclarations = null;
-  };
-  function installPolymerWarning() {
-    if (window.Polymer === polymerStub) {
-      window.Polymer = function() {
-        throw new Error("You tried to use polymer without loading it first. To " + 'load polymer, <link rel="import" href="' + 'components/polymer/polymer.html">');
-      };
-    }
-  }
-  if (HTMLImports.useNative) {
-    installPolymerWarning();
-  } else {
-    addEventListener("DOMContentLoaded", installPolymerWarning);
-  }
-})(window.WebComponents);
-
-(function(scope) {
   var style = document.createElement("style");
   style.textContent = "" + "body {" + "transition: opacity ease-in 0.2s;" + " } \n" + "body[unresolved] {" + "opacity: 0; display: block; overflow: hidden; position: relative;" + " } \n";
   var head = document.querySelector("head");
@@ -6370,4 +7215,4 @@ CustomElements.addModule(function(scope) {
 
 (function(scope) {
   window.Platform = scope;
-})(window.WebComponents);
+})(window.WebComponents);