diff --git a/CHANGELOG.md b/CHANGELOG.md
index 460ecb7..9de10b4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+#### 0.12.2
+  * Update to JS version
+    [0.7.20](https://github.com/webcomponents/webcomponentsjs/tree/v0.7.20).
+
 #### 0.12.1
   * Update analyzer to `^0.27.0` and update to the test package.
 
diff --git a/lib/CustomElements.js b/lib/CustomElements.js
index e9d3884..aa358bd 100644
--- a/lib/CustomElements.js
+++ b/lib/CustomElements.js
@@ -7,7 +7,7 @@
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
-// @version 0.7.3
+// @version 0.7.20
 if (typeof WeakMap === "undefined") {
   (function() {
     var defineProperty = Object.defineProperty;
@@ -45,6 +45,9 @@
 }
 
 (function(global) {
+  if (global.JsMutationObserver) {
+    return;
+  }
   var registrationsTable = new WeakMap();
   var setImmediate;
   if (/Trident|Edge/.test(navigator.userAgent)) {
@@ -340,8 +343,83 @@
     }
   };
   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.CustomElements = window.CustomElements || {
   flags: {}
@@ -361,11 +439,12 @@
   scope.addModule = addModule;
   scope.initializeModules = initializeModules;
   scope.hasNative = Boolean(document.registerElement);
-  scope.useNative = !flags.register && scope.hasNative && !window.ShadowDOMPolyfill && (!window.HTMLImports || HTMLImports.useNative);
+  scope.isIE = /Trident/.test(navigator.userAgent);
+  scope.useNative = !flags.register && scope.hasNative && !window.ShadowDOMPolyfill && (!window.HTMLImports || window.HTMLImports.useNative);
 })(window.CustomElements);
 
 window.CustomElements.addModule(function(scope) {
-  var IMPORT_LINK_TYPE = window.HTMLImports ? HTMLImports.IMPORT_LINK_TYPE : "none";
+  var IMPORT_LINK_TYPE = window.HTMLImports ? window.HTMLImports.IMPORT_LINK_TYPE : "none";
   function forSubtree(node, cb) {
     findAllElements(node, function(e) {
       if (cb(e)) {
@@ -402,7 +481,7 @@
     _forDocumentTree(doc, cb, []);
   }
   function _forDocumentTree(doc, cb, processingDocuments) {
-    doc = wrap(doc);
+    doc = window.wrap(doc);
     if (processingDocuments.indexOf(doc) >= 0) {
       return;
     }
@@ -423,32 +502,27 @@
   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) {
@@ -467,7 +541,7 @@
     pendingMutations = [];
   }
   function attached(element) {
-    if (hasPolyfillMutations) {
+    if (hasThrottledAttached) {
       deferMutation(function() {
         _attached(element);
       });
@@ -476,12 +550,10 @@
     }
   }
   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();
       }
     }
   }
@@ -492,7 +564,7 @@
     });
   }
   function detached(element) {
-    if (hasPolyfillMutations) {
+    if (hasThrottledAttached) {
       deferMutation(function() {
         _detached(element);
       });
@@ -501,18 +573,16 @@
     }
   }
   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;
@@ -530,7 +600,7 @@
       }
     }
   }
-  function handler(mutations) {
+  function handler(root, mutations) {
     if (flags.dom) {
       var mx = mutations[0];
       if (mx && mx.type === "childList" && mx.addedNodes) {
@@ -545,13 +615,14 @@
       }
       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) {
@@ -564,16 +635,16 @@
     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();
     }
   }
@@ -582,7 +653,7 @@
     if (inRoot.__observer) {
       return;
     }
-    var observer = new MutationObserver(handler);
+    var observer = new MutationObserver(handler.bind(this, inRoot));
     observer.observe(inRoot, {
       childList: true,
       subtree: true
@@ -590,9 +661,10 @@
     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();
   }
@@ -603,34 +675,38 @@
   if (originalCreateShadowRoot) {
     Element.prototype.createShadowRoot = function() {
       var root = originalCreateShadowRoot.call(this);
-      CustomElements.watchShadow(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;
 });
 
 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);
@@ -638,8 +714,10 @@
     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;
   }
@@ -676,7 +754,7 @@
 });
 
 window.CustomElements.addModule(function(scope) {
-  var isIE11OrOlder = scope.isIE11OrOlder;
+  var isIE = scope.isIE;
   var upgradeDocumentTree = scope.upgradeDocumentTree;
   var upgradeAll = scope.upgradeAll;
   var upgradeWithDefinition = scope.upgradeWithDefinition;
@@ -767,17 +845,23 @@
       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;
     }
   }
@@ -839,6 +923,9 @@
   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) {
@@ -863,7 +950,7 @@
   }
   wrapDomMethodToForceUpgrade(Node.prototype, "cloneNode");
   wrapDomMethodToForceUpgrade(document, "importNode");
-  if (isIE11OrOlder) {
+  if (isIE) {
     (function() {
       var importNode = document.importNode;
       document.importNode = function() {
@@ -891,7 +978,7 @@
 (function(scope) {
   var useNative = scope.useNative;
   var initializeModules = scope.initializeModules;
-  var isIE11OrOlder = /Trident/.test(navigator.userAgent);
+  var isIE = scope.isIE;
   if (useNative) {
     var nop = function() {};
     scope.watchShadow = nop;
@@ -907,50 +994,48 @@
     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 (isIE11OrOlder && typeof window.CustomEvent !== "function") {
-    window.CustomEvent = function(inType, params) {
-      params = params || {};
-      var e = document.createEvent("CustomEvent");
-      e.initCustomEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable), params.detail);
-      return e;
     };
-    window.CustomEvent.prototype = window.Event.prototype;
+  }
+  function bootstrap() {
+    upgradeDocumentTree(window.wrap(document));
+    window.CustomElements.ready = true;
+    var requestAnimationFrame = window.requestAnimationFrame || function(f) {
+      setTimeout(f, 16);
+    };
+    requestAnimationFrame(function() {
+      setTimeout(function() {
+        window.CustomElements.readyTime = Date.now();
+        if (window.HTMLImports) {
+          window.CustomElements.elapsed = window.CustomElements.readyTime - window.HTMLImports.readyTime;
+        }
+        document.dispatchEvent(new CustomEvent("WebComponentsReady", {
+          bubbles: true
+        }));
+      });
+    });
   }
   if (document.readyState === "complete" || scope.flags.eager) {
     bootstrap();
   } else if (document.readyState === "interactive" && !window.attachEvent && (!window.HTMLImports || window.HTMLImports.ready)) {
     bootstrap();
   } else {
-    var loadEvent = window.HTMLImports && !HTMLImports.ready ? "HTMLImportsLoaded" : "DOMContentLoaded";
+    var loadEvent = window.HTMLImports && !window.HTMLImports.ready ? "HTMLImportsLoaded" : "DOMContentLoaded";
     window.addEventListener(loadEvent, bootstrap);
   }
-  scope.isIE11OrOlder = isIE11OrOlder;
 })(window.CustomElements);
\ No newline at end of file
diff --git a/lib/CustomElements.min.js b/lib/CustomElements.min.js
index ca224db..f79e77f 100644
--- a/lib/CustomElements.min.js
+++ b/lib/CustomElements.min.js
@@ -7,5 +7,5 @@
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
-// @version 0.7.3
-"undefined"==typeof WeakMap&&!function(){var e=Object.defineProperty,t=Date.now()%1e9,r=function(){this.name="__st"+(1e9*Math.random()>>>0)+(t++ +"__")};r.prototype={set:function(t,r){var n=t[this.name];return n&&n[0]===t?n[1]=r:e(t,this.name,{value:[t,r],writable:!0}),this},get:function(e){var t;return(t=e[this.name])&&t[0]===e?t[1]:void 0},"delete":function(e){var t=e[this.name];return t&&t[0]===e?(t[0]=t[1]=void 0,!0):!1},has:function(e){var t=e[this.name];return t?t[0]===e:!1}},window.WeakMap=r}(),function(e){function t(e){_.push(e),b||(b=!0,h(n))}function r(e){return window.ShadowDOMPolyfill&&window.ShadowDOMPolyfill.wrapIfNeeded(e)||e}function n(){b=!1;var e=_;_=[],e.sort(function(e,t){return e.uid_-t.uid_});var t=!1;e.forEach(function(e){var r=e.takeRecords();o(e),r.length&&(e.callback_(r,e),t=!0)}),t&&n()}function o(e){e.nodes_.forEach(function(t){var r=v.get(t);r&&r.forEach(function(t){t.observer===e&&t.removeTransientObservers()})})}function i(e,t){for(var r=e;r;r=r.parentNode){var n=v.get(r);if(n)for(var o=0;o<n.length;o++){var i=n[o],a=i.options;if(r===e||a.subtree){var s=t(a);s&&i.enqueue(s)}}}}function a(e){this.callback_=e,this.nodes_=[],this.records_=[],this.uid_=++E}function s(e,t){this.type=e,this.target=t,this.addedNodes=[],this.removedNodes=[],this.previousSibling=null,this.nextSibling=null,this.attributeName=null,this.attributeNamespace=null,this.oldValue=null}function d(e){var t=new s(e.type,e.target);return t.addedNodes=e.addedNodes.slice(),t.removedNodes=e.removedNodes.slice(),t.previousSibling=e.previousSibling,t.nextSibling=e.nextSibling,t.attributeName=e.attributeName,t.attributeNamespace=e.attributeNamespace,t.oldValue=e.oldValue,t}function u(e,t){return y=new s(e,t)}function c(e){return N?N:(N=d(y),N.oldValue=e,N)}function l(){y=N=void 0}function f(e){return e===N||e===y}function p(e,t){return e===t?e:N&&f(e)?N:null}function m(e,t,r){this.observer=e,this.target=t,this.options=r,this.transientObservedNodes=[]}var h,v=new WeakMap;if(/Trident|Edge/.test(navigator.userAgent))h=setTimeout;else if(window.setImmediate)h=window.setImmediate;else{var w=[],g=String(Math.random());window.addEventListener("message",function(e){if(e.data===g){var t=w;w=[],t.forEach(function(e){e()})}}),h=function(e){w.push(e),window.postMessage(g,"*")}}var b=!1,_=[],E=0;a.prototype={observe:function(e,t){if(e=r(e),!t.childList&&!t.attributes&&!t.characterData||t.attributeOldValue&&!t.attributes||t.attributeFilter&&t.attributeFilter.length&&!t.attributes||t.characterDataOldValue&&!t.characterData)throw new SyntaxError;var n=v.get(e);n||v.set(e,n=[]);for(var o,i=0;i<n.length;i++)if(n[i].observer===this){o=n[i],o.removeListeners(),o.options=t;break}o||(o=new m(this,e,t),n.push(o),this.nodes_.push(e)),o.addListeners()},disconnect:function(){this.nodes_.forEach(function(e){for(var t=v.get(e),r=0;r<t.length;r++){var n=t[r];if(n.observer===this){n.removeListeners(),t.splice(r,1);break}}},this),this.records_=[]},takeRecords:function(){var e=this.records_;return this.records_=[],e}};var y,N;m.prototype={enqueue:function(e){var r=this.observer.records_,n=r.length;if(r.length>0){var o=r[n-1],i=p(o,e);if(i)return void(r[n-1]=i)}else t(this.observer);r[n]=e},addListeners:function(){this.addListeners_(this.target)},addListeners_:function(e){var t=this.options;t.attributes&&e.addEventListener("DOMAttrModified",this,!0),t.characterData&&e.addEventListener("DOMCharacterDataModified",this,!0),t.childList&&e.addEventListener("DOMNodeInserted",this,!0),(t.childList||t.subtree)&&e.addEventListener("DOMNodeRemoved",this,!0)},removeListeners:function(){this.removeListeners_(this.target)},removeListeners_:function(e){var t=this.options;t.attributes&&e.removeEventListener("DOMAttrModified",this,!0),t.characterData&&e.removeEventListener("DOMCharacterDataModified",this,!0),t.childList&&e.removeEventListener("DOMNodeInserted",this,!0),(t.childList||t.subtree)&&e.removeEventListener("DOMNodeRemoved",this,!0)},addTransientObserver:function(e){if(e!==this.target){this.addListeners_(e),this.transientObservedNodes.push(e);var t=v.get(e);t||v.set(e,t=[]),t.push(this)}},removeTransientObservers:function(){var e=this.transientObservedNodes;this.transientObservedNodes=[],e.forEach(function(e){this.removeListeners_(e);for(var t=v.get(e),r=0;r<t.length;r++)if(t[r]===this){t.splice(r,1);break}},this)},handleEvent:function(e){switch(e.stopImmediatePropagation(),e.type){case"DOMAttrModified":var t=e.attrName,r=e.relatedNode.namespaceURI,n=e.target,o=new u("attributes",n);o.attributeName=t,o.attributeNamespace=r;var 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\ No newline at end of file
diff --git a/lib/HTMLImports.js b/lib/HTMLImports.js
index eb560c4..53859cc 100644
--- a/lib/HTMLImports.js
+++ b/lib/HTMLImports.js
@@ -7,7 +7,7 @@
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
-// @version 0.7.3
+// @version 0.7.20
 if (typeof WeakMap === "undefined") {
   (function() {
     var defineProperty = Object.defineProperty;
@@ -45,6 +45,9 @@
 }
 
 (function(global) {
+  if (global.JsMutationObserver) {
+    return;
+  }
   var registrationsTable = new WeakMap();
   var setImmediate;
   if (/Trident|Edge/.test(navigator.userAgent)) {
@@ -340,8 +343,83 @@
     }
   };
   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: {}
@@ -352,19 +430,19 @@
   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
   };
   Object.defineProperty(document, "_currentScript", currentScriptDescriptor);
   Object.defineProperty(rootDocument, "_currentScript", currentScriptDescriptor);
-  var isIE = /Trident|Edge/.test(navigator.userAgent);
+  var isIE = /Trident/.test(navigator.userAgent);
   function whenReady(callback, doc) {
     doc = doc || rootDocument;
     whenDocumentReady(function() {
@@ -418,6 +496,7 @@
     if (importCount) {
       for (var i = 0, imp; i < importCount && (imp = imports[i]); i++) {
         if (isImportLoaded(imp)) {
+          newImports.push(this);
           parsedCount++;
           checkDone();
         } else {
@@ -473,8 +552,8 @@
     })();
   }
   whenReady(function(detail) {
-    HTMLImports.ready = true;
-    HTMLImports.readyTime = new Date().getTime();
+    window.HTMLImports.ready = true;
+    window.HTMLImports.readyTime = new Date().getTime();
     var evt = rootDocument.createEvent("CustomEvent");
     evt.initCustomEvent("HTMLImportsLoaded", true, true, detail);
     rootDocument.dispatchEvent(evt);
@@ -544,10 +623,14 @@
       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);
         }
@@ -697,7 +780,7 @@
   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="application/javascript"]', '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",
@@ -748,8 +831,9 @@
       }
     },
     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;
@@ -810,6 +894,8 @@
     trackElement: function(elt, callback) {
       var self = this;
       var done = function(e) {
+        elt.removeEventListener("load", done);
+        elt.removeEventListener("error", done);
         if (callback) {
           callback(e);
         }
@@ -847,7 +933,9 @@
       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);
@@ -863,7 +951,7 @@
         for (var i = 0, l = nodes.length, p = 0, 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;
             }
@@ -886,7 +974,7 @@
       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;
@@ -960,7 +1048,7 @@
           }
           this.documents[url] = doc;
         }
-        elt.import = doc;
+        elt.__doc = doc;
       }
       parser.parseNext();
     },
@@ -1056,19 +1144,10 @@
   if (scope.useNative) {
     return;
   }
-  if (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;
-  }
   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();
diff --git a/lib/HTMLImports.min.js b/lib/HTMLImports.min.js
index 84ec6b8..c67cc5d 100644
--- a/lib/HTMLImports.min.js
+++ b/lib/HTMLImports.min.js
@@ -7,5 +7,5 @@
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
-// @version 0.7.3
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diff --git a/lib/MutationObserver.js b/lib/MutationObserver.js
index 34a2bb3..3fc9de8 100644
--- a/lib/MutationObserver.js
+++ b/lib/MutationObserver.js
@@ -7,7 +7,7 @@
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
-// @version 0.7.3
+// @version 0.7.20
 if (typeof WeakMap === "undefined") {
   (function() {
     var defineProperty = Object.defineProperty;
@@ -45,6 +45,9 @@
 }
 
 (function(global) {
+  if (global.JsMutationObserver) {
+    return;
+  }
   var registrationsTable = new WeakMap();
   var setImmediate;
   if (/Trident|Edge/.test(navigator.userAgent)) {
@@ -340,5 +343,8 @@
     }
   };
   global.JsMutationObserver = JsMutationObserver;
-  if (!global.MutationObserver) global.MutationObserver = JsMutationObserver;
-})(this);
\ No newline at end of file
+  if (!global.MutationObserver) {
+    global.MutationObserver = JsMutationObserver;
+    JsMutationObserver._isPolyfilled = true;
+  }
+})(self);
\ No newline at end of file
diff --git a/lib/MutationObserver.min.js b/lib/MutationObserver.min.js
index b5751a0..a73d437 100644
--- a/lib/MutationObserver.min.js
+++ b/lib/MutationObserver.min.js
@@ -7,5 +7,5 @@
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
-// @version 0.7.3
-"undefined"==typeof WeakMap&&!function(){var e=Object.defineProperty,t=Date.now()%1e9,r=function(){this.name="__st"+(1e9*Math.random()>>>0)+(t++ +"__")};r.prototype={set:function(t,r){var i=t[this.name];return i&&i[0]===t?i[1]=r:e(t,this.name,{value:[t,r],writable:!0}),this},get:function(e){var t;return(t=e[this.name])&&t[0]===e?t[1]:void 0},"delete":function(e){var t=e[this.name];return t&&t[0]===e?(t[0]=t[1]=void 0,!0):!1},has:function(e){var t=e[this.name];return t?t[0]===e:!1}},window.WeakMap=r}(),function(e){function t(e){O.push(e),N||(N=!0,b(i))}function r(e){return window.ShadowDOMPolyfill&&window.ShadowDOMPolyfill.wrapIfNeeded(e)||e}function i(){N=!1;var e=O;O=[],e.sort(function(e,t){return e.uid_-t.uid_});var t=!1;e.forEach(function(e){var r=e.takeRecords();n(e),r.length&&(e.callback_(r,e),t=!0)}),t&&i()}function n(e){e.nodes_.forEach(function(t){var r=p.get(t);r&&r.forEach(function(t){t.observer===e&&t.removeTransientObservers()})})}function a(e,t){for(var r=e;r;r=r.parentNode){var i=p.get(r);if(i)for(var n=0;n<i.length;n++){var a=i[n],s=a.options;if(r===e||s.subtree){var o=t(s);o&&a.enqueue(o)}}}}function s(e){this.callback_=e,this.nodes_=[],this.records_=[],this.uid_=++M}function o(e,t){this.type=e,this.target=t,this.addedNodes=[],this.removedNodes=[],this.previousSibling=null,this.nextSibling=null,this.attributeName=null,this.attributeNamespace=null,this.oldValue=null}function d(e){var t=new o(e.type,e.target);return t.addedNodes=e.addedNodes.slice(),t.removedNodes=e.removedNodes.slice(),t.previousSibling=e.previousSibling,t.nextSibling=e.nextSibling,t.attributeName=e.attributeName,t.attributeNamespace=e.attributeNamespace,t.oldValue=e.oldValue,t}function u(e,t){return D=new o(e,t)}function h(e){return w?w:(w=d(D),w.oldValue=e,w)}function c(){D=w=void 0}function v(e){return e===w||e===D}function l(e,t){return e===t?e:w&&v(e)?w:null}function f(e,t,r){this.observer=e,this.target=t,this.options=r,this.transientObservedNodes=[]}var b,p=new WeakMap;if(/Trident|Edge/.test(navigator.userAgent))b=setTimeout;else if(window.setImmediate)b=window.setImmediate;else{var g=[],m=String(Math.random());window.addEventListener("message",function(e){if(e.data===m){var t=g;g=[],t.forEach(function(e){e()})}}),b=function(e){g.push(e),window.postMessage(m,"*")}}var N=!1,O=[],M=0;s.prototype={observe:function(e,t){if(e=r(e),!t.childList&&!t.attributes&&!t.characterData||t.attributeOldValue&&!t.attributes||t.attributeFilter&&t.attributeFilter.length&&!t.attributes||t.characterDataOldValue&&!t.characterData)throw new SyntaxError;var i=p.get(e);i||p.set(e,i=[]);for(var n,a=0;a<i.length;a++)if(i[a].observer===this){n=i[a],n.removeListeners(),n.options=t;break}n||(n=new f(this,e,t),i.push(n),this.nodes_.push(e)),n.addListeners()},disconnect:function(){this.nodes_.forEach(function(e){for(var t=p.get(e),r=0;r<t.length;r++){var i=t[r];if(i.observer===this){i.removeListeners(),t.splice(r,1);break}}},this),this.records_=[]},takeRecords:function(){var e=this.records_;return this.records_=[],e}};var D,w;f.prototype={enqueue:function(e){var r=this.observer.records_,i=r.length;if(r.length>0){var n=r[i-1],a=l(n,e);if(a)return void(r[i-1]=a)}else t(this.observer);r[i]=e},addListeners:function(){this.addListeners_(this.target)},addListeners_:function(e){var t=this.options;t.attributes&&e.addEventListener("DOMAttrModified",this,!0),t.characterData&&e.addEventListener("DOMCharacterDataModified",this,!0),t.childList&&e.addEventListener("DOMNodeInserted",this,!0),(t.childList||t.subtree)&&e.addEventListener("DOMNodeRemoved",this,!0)},removeListeners:function(){this.removeListeners_(this.target)},removeListeners_:function(e){var t=this.options;t.attributes&&e.removeEventListener("DOMAttrModified",this,!0),t.characterData&&e.removeEventListener("DOMCharacterDataModified",this,!0),t.childList&&e.removeEventListener("DOMNodeInserted",this,!0),(t.childList||t.subtree)&&e.removeEventListener("DOMNodeRemoved",this,!0)},addTransientObserver:function(e){if(e!==this.target){this.addListeners_(e),this.transientObservedNodes.push(e);var t=p.get(e);t||p.set(e,t=[]),t.push(this)}},removeTransientObservers:function(){var e=this.transientObservedNodes;this.transientObservedNodes=[],e.forEach(function(e){this.removeListeners_(e);for(var t=p.get(e),r=0;r<t.length;r++)if(t[r]===this){t.splice(r,1);break}},this)},handleEvent:function(e){switch(e.stopImmediatePropagation(),e.type){case"DOMAttrModified":var t=e.attrName,r=e.relatedNode.namespaceURI,i=e.target,n=new u("attributes",i);n.attributeName=t,n.attributeNamespace=r;var s=e.attrChange===MutationEvent.ADDITION?null:e.prevValue;a(i,function(e){return!e.attributes||e.attributeFilter&&e.attributeFilter.length&&-1===e.attributeFilter.indexOf(t)&&-1===e.attributeFilter.indexOf(r)?void 0:e.attributeOldValue?h(s):n});break;case"DOMCharacterDataModified":var i=e.target,n=u("characterData",i),s=e.prevValue;a(i,function(e){return e.characterData?e.characterDataOldValue?h(s):n:void 0});break;case"DOMNodeRemoved":this.addTransientObserver(e.target);case"DOMNodeInserted":var o,d,v=e.target;"DOMNodeInserted"===e.type?(o=[v],d=[]):(o=[],d=[v]);var l=v.previousSibling,f=v.nextSibling,n=u("childList",e.target.parentNode);n.addedNodes=o,n.removedNodes=d,n.previousSibling=l,n.nextSibling=f,a(e.relatedNode,function(e){return e.childList?n:void 0})}c()}},e.JsMutationObserver=s,e.MutationObserver||(e.MutationObserver=s)}(this);
\ No newline at end of file
+// @version 0.7.20
+"undefined"==typeof WeakMap&&!function(){var e=Object.defineProperty,t=Date.now()%1e9,r=function(){this.name="__st"+(1e9*Math.random()>>>0)+(t++ +"__")};r.prototype={set:function(t,r){var i=t[this.name];return i&&i[0]===t?i[1]=r:e(t,this.name,{value:[t,r],writable:!0}),this},get:function(e){var t;return(t=e[this.name])&&t[0]===e?t[1]:void 0},"delete":function(e){var t=e[this.name];return t&&t[0]===e?(t[0]=t[1]=void 0,!0):!1},has:function(e){var t=e[this.name];return t?t[0]===e:!1}},window.WeakMap=r}(),function(e){function t(e){N.push(e),O||(O=!0,b(i))}function r(e){return window.ShadowDOMPolyfill&&window.ShadowDOMPolyfill.wrapIfNeeded(e)||e}function i(){O=!1;var e=N;N=[],e.sort(function(e,t){return e.uid_-t.uid_});var t=!1;e.forEach(function(e){var r=e.takeRecords();n(e),r.length&&(e.callback_(r,e),t=!0)}),t&&i()}function n(e){e.nodes_.forEach(function(t){var r=p.get(t);r&&r.forEach(function(t){t.observer===e&&t.removeTransientObservers()})})}function a(e,t){for(var r=e;r;r=r.parentNode){var i=p.get(r);if(i)for(var n=0;n<i.length;n++){var a=i[n],s=a.options;if(r===e||s.subtree){var o=t(s);o&&a.enqueue(o)}}}}function s(e){this.callback_=e,this.nodes_=[],this.records_=[],this.uid_=++M}function o(e,t){this.type=e,this.target=t,this.addedNodes=[],this.removedNodes=[],this.previousSibling=null,this.nextSibling=null,this.attributeName=null,this.attributeNamespace=null,this.oldValue=null}function d(e){var t=new o(e.type,e.target);return t.addedNodes=e.addedNodes.slice(),t.removedNodes=e.removedNodes.slice(),t.previousSibling=e.previousSibling,t.nextSibling=e.nextSibling,t.attributeName=e.attributeName,t.attributeNamespace=e.attributeNamespace,t.oldValue=e.oldValue,t}function u(e,t){return D=new o(e,t)}function h(e){return w?w:(w=d(D),w.oldValue=e,w)}function c(){D=w=void 0}function v(e){return e===w||e===D}function l(e,t){return e===t?e:w&&v(e)?w:null}function f(e,t,r){this.observer=e,this.target=t,this.options=r,this.transientObservedNodes=[]}if(!e.JsMutationObserver){var b,p=new WeakMap;if(/Trident|Edge/.test(navigator.userAgent))b=setTimeout;else if(window.setImmediate)b=window.setImmediate;else{var g=[],m=String(Math.random());window.addEventListener("message",function(e){if(e.data===m){var t=g;g=[],t.forEach(function(e){e()})}}),b=function(e){g.push(e),window.postMessage(m,"*")}}var O=!1,N=[],M=0;s.prototype={observe:function(e,t){if(e=r(e),!t.childList&&!t.attributes&&!t.characterData||t.attributeOldValue&&!t.attributes||t.attributeFilter&&t.attributeFilter.length&&!t.attributes||t.characterDataOldValue&&!t.characterData)throw new SyntaxError;var i=p.get(e);i||p.set(e,i=[]);for(var n,a=0;a<i.length;a++)if(i[a].observer===this){n=i[a],n.removeListeners(),n.options=t;break}n||(n=new f(this,e,t),i.push(n),this.nodes_.push(e)),n.addListeners()},disconnect:function(){this.nodes_.forEach(function(e){for(var t=p.get(e),r=0;r<t.length;r++){var i=t[r];if(i.observer===this){i.removeListeners(),t.splice(r,1);break}}},this),this.records_=[]},takeRecords:function(){var e=this.records_;return this.records_=[],e}};var D,w;f.prototype={enqueue:function(e){var r=this.observer.records_,i=r.length;if(r.length>0){var n=r[i-1],a=l(n,e);if(a)return void(r[i-1]=a)}else t(this.observer);r[i]=e},addListeners:function(){this.addListeners_(this.target)},addListeners_:function(e){var t=this.options;t.attributes&&e.addEventListener("DOMAttrModified",this,!0),t.characterData&&e.addEventListener("DOMCharacterDataModified",this,!0),t.childList&&e.addEventListener("DOMNodeInserted",this,!0),(t.childList||t.subtree)&&e.addEventListener("DOMNodeRemoved",this,!0)},removeListeners:function(){this.removeListeners_(this.target)},removeListeners_:function(e){var t=this.options;t.attributes&&e.removeEventListener("DOMAttrModified",this,!0),t.characterData&&e.removeEventListener("DOMCharacterDataModified",this,!0),t.childList&&e.removeEventListener("DOMNodeInserted",this,!0),(t.childList||t.subtree)&&e.removeEventListener("DOMNodeRemoved",this,!0)},addTransientObserver:function(e){if(e!==this.target){this.addListeners_(e),this.transientObservedNodes.push(e);var t=p.get(e);t||p.set(e,t=[]),t.push(this)}},removeTransientObservers:function(){var e=this.transientObservedNodes;this.transientObservedNodes=[],e.forEach(function(e){this.removeListeners_(e);for(var t=p.get(e),r=0;r<t.length;r++)if(t[r]===this){t.splice(r,1);break}},this)},handleEvent:function(e){switch(e.stopImmediatePropagation(),e.type){case"DOMAttrModified":var t=e.attrName,r=e.relatedNode.namespaceURI,i=e.target,n=new u("attributes",i);n.attributeName=t,n.attributeNamespace=r;var s=e.attrChange===MutationEvent.ADDITION?null:e.prevValue;a(i,function(e){return!e.attributes||e.attributeFilter&&e.attributeFilter.length&&-1===e.attributeFilter.indexOf(t)&&-1===e.attributeFilter.indexOf(r)?void 0:e.attributeOldValue?h(s):n});break;case"DOMCharacterDataModified":var i=e.target,n=u("characterData",i),s=e.prevValue;a(i,function(e){return e.characterData?e.characterDataOldValue?h(s):n:void 0});break;case"DOMNodeRemoved":this.addTransientObserver(e.target);case"DOMNodeInserted":var o,d,v=e.target;"DOMNodeInserted"===e.type?(o=[v],d=[]):(o=[],d=[v]);var l=v.previousSibling,f=v.nextSibling,n=u("childList",e.target.parentNode);n.addedNodes=o,n.removedNodes=d,n.previousSibling=l,n.nextSibling=f,a(e.relatedNode,function(e){return e.childList?n:void 0})}c()}},e.JsMutationObserver=s,e.MutationObserver||(e.MutationObserver=s,s._isPolyfilled=!0)}}(self);
\ No newline at end of file
diff --git a/lib/ShadowDOM.js b/lib/ShadowDOM.js
index 7461cf9..c3658c2 100644
--- a/lib/ShadowDOM.js
+++ b/lib/ShadowDOM.js
@@ -7,7 +7,7 @@
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
-// @version 0.7.3
+// @version 0.7.20
 if (typeof WeakMap === "undefined") {
   (function() {
     var defineProperty = Object.defineProperty;
@@ -306,6 +306,7 @@
       });
     });
   }
+  scope.addForwardingProperties = addForwardingProperties;
   scope.assert = assert;
   scope.constructorTable = constructorTable;
   scope.defineGetter = defineGetter;
@@ -1118,6 +1119,24 @@
       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;
@@ -1745,8 +1764,8 @@
   var originalInsertBefore = OriginalNode.prototype.insertBefore;
   var originalRemoveChild = OriginalNode.prototype.removeChild;
   var originalReplaceChild = OriginalNode.prototype.replaceChild;
-  var isIe = /Trident|Edge/.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) {
@@ -2723,7 +2742,7 @@
       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;
@@ -3145,18 +3164,29 @@
   "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;
   }
-  defineWrapGetter(SVGElement, "ownerSVGElement");
+  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);
 
@@ -3266,6 +3296,7 @@
 
 (function(scope) {
   "use strict";
+  var addForwardingProperties = scope.addForwardingProperties;
   var mixin = scope.mixin;
   var registerWrapper = scope.registerWrapper;
   var setWrapper = scope.setWrapper;
@@ -3290,6 +3321,10 @@
       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
@@ -3300,20 +3335,27 @@
 
 (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 DocumentFragment = registerObject(document.createDocumentFragment());
+  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;
-  scope.wrappers.DocumentFragment = DocumentFragment;
 })(window.ShadowDOMPolyfill);
 
 (function(scope) {
@@ -3328,6 +3370,7 @@
   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) {
@@ -3360,6 +3403,28 @@
     },
     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);
+      if (activeElement === this.host) {
+        return null;
+      }
+      while (!this.contains(activeElement) && !this.host.contains(activeElement)) {
+        while (activeElement.parentNode) {
+          activeElement = activeElement.parentNode;
+        }
+        if (activeElement.host) {
+          activeElement = activeElement.host;
+        } else {
+          return null;
+        }
+      }
+      return activeElement;
     }
   });
   scope.wrappers.ShadowRoot = ShadowRoot;
@@ -3951,7 +4016,7 @@
       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();
@@ -4024,6 +4089,7 @@
   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;
@@ -4047,6 +4113,22 @@
   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() {
diff --git a/lib/ShadowDOM.min.js b/lib/ShadowDOM.min.js
index 1d8e1b8..b225d92 100644
--- a/lib/ShadowDOM.min.js
+++ b/lib/ShadowDOM.min.js
@@ -7,9 +7,7 @@
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
-// @version 0.7.3
-"undefined"==typeof WeakMap&&!function(){var e=Object.defineProperty,t=Date.now()%1e9,n=function(){this.name="__st"+(1e9*Math.random()>>>0)+(t++ +"__")};n.prototype={set:function(t,n){var r=t[this.name];return r&&r[0]===t?r[1]=n:e(t,this.name,{value:[t,n],writable:!0}),this},get:function(e){var t;return(t=e[this.name])&&t[0]===e?t[1]:void 0},"delete":function(e){var t=e[this.name];return t&&t[0]===e?(t[0]=t[1]=void 0,!0):!1},has:function(e){var t=e[this.name];return t?t[0]===e:!1}},window.WeakMap=n}(),window.ShadowDOMPolyfill={},function(e){"use strict";function t(){if("undefined"!=typeof chrome&&chrome.app&&chrome.app.runtime)return!1;if(navigator.getDeviceStorage)return!1;try{var e=new Function("return true;");return e()}catch(t){return!1}}function n(e){if(!e)throw new Error("Assertion failed")}function r(e,t){for(var n=k(t),r=0;r<n.length;r++){var o=n[r];A(e,o,F(t,o))}return e}function o(e,t){for(var n=k(t),r=0;r<n.length;r++){var 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\ No newline at end of file
diff --git a/lib/build.log b/lib/build.log
index d640c60..3cfec4f 100644
--- a/lib/build.log
+++ b/lib/build.log
@@ -1,47 +1,33 @@
 BUILD LOG
 ---------
-Build Time: 2014-10-07T18:03:14
+Build Time: 2015-12-15T17:26:55-0800
 
 NODEJS INFORMATION
 ==================
-nodejs: v0.10.21
-chai: 1.9.0
-grunt: 0.4.2
-grunt-audit: 0.0.2
-grunt-concat-sourcemap: 0.4.1
-grunt-contrib-concat: 0.3.0
-grunt-contrib-uglify: 0.3.2
-grunt-contrib-yuidoc: 0.5.1
-grunt-karma: 0.6.2
-karma: 0.10.9
-karma-chrome-launcher: 0.1.2
-karma-coffee-preprocessor: 0.1.3
-karma-crbot-reporter: 0.0.4
-karma-firefox-launcher: 0.1.3
-karma-html2js-preprocessor: 0.1.0
-karma-ie-launcher: 0.1.1
-karma-jasmine: 0.1.5
-karma-mocha: 0.1.1
-karma-phantomjs-launcher: 0.1.2
-karma-requirejs: 0.2.1
-karma-safari-launcher: 0.1.1
-karma-script-launcher: 0.1.0
-mocha: 1.17.1
-requirejs: 2.1.11
+nodejs: v4.2.3
+gulp: 3.9.0
+gulp-audit: 1.0.0
+gulp-concat: 2.6.0
+gulp-header: 1.7.1
+gulp-uglify: 1.5.1
+run-sequence: 1.1.5
+web-component-tester: 4.0.2
 
 REPO REVISIONS
 ==============
-WeakMap: 56eebff250e6cf82dfd767b7703599e047d8b10f
-observe-js: fa70c37099026225876f7c7a26bdee7c48129f1c
-
-ShadowDOM: c524de1304cc5a8863326ceeedb325cda43cd42f
-  + cherry pick pull request #515
-  (local hash: 14a48768d21603c7fc54dcef392b48dce0baa33f)
-URL: cf5d82e444d2a029834365a8b9d185fd792227f0
-MutationObservers: b1039ace292dec90b246317db28ff91d653375e7
-HTMLImports: 6dea2dd969dc4dfb594ae33d4b072130c4890da5
-CustomElements: 321f5428f0c0486d45dd6b384aea9d07021e431d
+webcomponentsjs: 5f1284369eb57e94ca4e88d5d71ceaeb65d1c569
 
 BUILD HASHES
 ============
-build/platform.js: 5b8a1707ff61149f8d491be777e197aeaae5da41
+CustomElements.js: 2e3f1d24da1b907cc328b6276f336aed65a07f11
+CustomElements.min.js: a762e3c191cc8d40094650317eace96595ddb2f7
+HTMLImports.js: 83d1d2df9b1fc622712e33e61b42a11445699b6b
+HTMLImports.min.js: a3f8245b26035a6452acadba2d95a5f2653b357e
+MutationObserver.js: 830bdcc25cdc392491d29b350ca077308f3baf4d
+MutationObserver.min.js: 73cbbfa3d44343e0286c133d7d5139dedd9a9765
+ShadowDOM.js: fa039071d7f15dba05d9cea27267d048cfddd1bf
+ShadowDOM.min.js: 975f1950c1347181b067a2d989ca1d8fafe854db
+webcomponents-lite.js: ab4d2adff62906fe3860fed00ee2584146b0f162
+webcomponents-lite.min.js: e59f28a7684cb56c84f83e411b13f0167c19898e
+webcomponents.js: 4881aa5c0dc2d730053ea701b11566cc04464738
+webcomponents.min.js: 305994efdabba100244df45ae6d86894bc69cd53
\ No newline at end of file
diff --git a/lib/webcomponents-lite.js b/lib/webcomponents-lite.js
index b7a03e6..3a133a1 100644
--- a/lib/webcomponents-lite.js
+++ b/lib/webcomponents-lite.js
@@ -7,13 +7,14 @@
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
-// @version 0.7.3
-window.WebComponents = window.WebComponents || {};
-
-(function(scope) {
-  var flags = scope.flags || {};
+// @version 0.7.20
+(function() {
+  window.WebComponents = window.WebComponents || {
+    flags: {}
+  };
   var file = "webcomponents-lite.js";
   var script = document.querySelector('script[src*="' + file + '"]');
+  var flags = {};
   if (!flags.noOpts) {
     location.search.slice(1).split("&").forEach(function(option) {
       var parts = option.split("=");
@@ -29,7 +30,7 @@
         }
       }
     }
-    if (flags.log) {
+    if (flags.log && flags.log.split) {
       var parts = flags.log.split(",");
       flags.log = {};
       parts.forEach(function(f) {
@@ -39,20 +40,14 @@
       flags.log = {};
     }
   }
-  flags.shadow = flags.shadow || flags.shadowdom || flags.polyfill;
-  if (flags.shadow === "native") {
-    flags.shadow = false;
-  } else {
-    flags.shadow = flags.shadow || !HTMLElement.prototype.createShadowRoot;
-  }
   if (flags.register) {
     window.CustomElements = window.CustomElements || {
       flags: {}
     };
     window.CustomElements.flags.register = flags.register;
   }
-  scope.flags = flags;
-})(window.WebComponents);
+  WebComponents.flags = flags;
+})();
 
 (function(scope) {
   "use strict";
@@ -574,7 +569,7 @@
     };
   }
   scope.URL = jURL;
-})(this);
+})(self);
 
 if (typeof WeakMap === "undefined") {
   (function() {
@@ -613,6 +608,9 @@
 }
 
 (function(global) {
+  if (global.JsMutationObserver) {
+    return;
+  }
   var registrationsTable = new WeakMap();
   var setImmediate;
   if (/Trident|Edge/.test(navigator.userAgent)) {
@@ -908,8 +906,167 @@
     }
   };
   global.JsMutationObserver = JsMutationObserver;
-  if (!global.MutationObserver) global.MutationObserver = JsMutationObserver;
-})(this);
+  if (!global.MutationObserver) {
+    global.MutationObserver = JsMutationObserver;
+    JsMutationObserver._isPolyfilled = true;
+  }
+})(self);
+
+if (typeof HTMLTemplateElement === "undefined") {
+  (function() {
+    var TEMPLATE_TAG = "template";
+    var contentDoc = document.implementation.createHTMLDocument("template");
+    var canDecorate = true;
+    HTMLTemplateElement = function() {};
+    HTMLTemplateElement.prototype = Object.create(HTMLElement.prototype);
+    HTMLTemplateElement.decorate = function(template) {
+      if (template.content) {
+        return;
+      }
+      template.content = contentDoc.createDocumentFragment();
+      var child;
+      while (child = template.firstChild) {
+        template.content.appendChild(child);
+      }
+      if (canDecorate) {
+        try {
+          Object.defineProperty(template, "innerHTML", {
+            get: function() {
+              var o = "";
+              for (var e = this.content.firstChild; e; e = e.nextSibling) {
+                o += e.outerHTML || escapeData(e.data);
+              }
+              return o;
+            },
+            set: function(text) {
+              contentDoc.body.innerHTML = text;
+              HTMLTemplateElement.bootstrap(contentDoc);
+              while (this.content.firstChild) {
+                this.content.removeChild(this.content.firstChild);
+              }
+              while (contentDoc.body.firstChild) {
+                this.content.appendChild(contentDoc.body.firstChild);
+              }
+            },
+            configurable: true
+          });
+        } catch (err) {
+          canDecorate = false;
+        }
+      }
+      HTMLTemplateElement.bootstrap(template.content);
+    };
+    HTMLTemplateElement.bootstrap = function(doc) {
+      var templates = doc.querySelectorAll(TEMPLATE_TAG);
+      for (var i = 0, l = templates.length, t; i < l && (t = templates[i]); i++) {
+        HTMLTemplateElement.decorate(t);
+      }
+    };
+    document.addEventListener("DOMContentLoaded", function() {
+      HTMLTemplateElement.bootstrap(document);
+    });
+    var createElement = document.createElement;
+    document.createElement = function() {
+      "use strict";
+      var el = createElement.apply(document, arguments);
+      if (el.localName == "template") {
+        HTMLTemplateElement.decorate(el);
+      }
+      return el;
+    };
+    var escapeDataRegExp = /[&\u00A0<>]/g;
+    function escapeReplace(c) {
+      switch (c) {
+       case "&":
+        return "&amp;";
+
+       case "<":
+        return "&lt;";
+
+       case ">":
+        return "&gt;";
+
+       case " ":
+        return "&nbsp;";
+      }
+    }
+    function escapeData(s) {
+      return s.replace(escapeDataRegExp, escapeReplace);
+    }
+  })();
+}
+
+(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: {}
@@ -920,19 +1077,19 @@
   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
   };
   Object.defineProperty(document, "_currentScript", currentScriptDescriptor);
   Object.defineProperty(rootDocument, "_currentScript", currentScriptDescriptor);
-  var isIE = /Trident|Edge/.test(navigator.userAgent);
+  var isIE = /Trident/.test(navigator.userAgent);
   function whenReady(callback, doc) {
     doc = doc || rootDocument;
     whenDocumentReady(function() {
@@ -986,6 +1143,7 @@
     if (importCount) {
       for (var i = 0, imp; i < importCount && (imp = imports[i]); i++) {
         if (isImportLoaded(imp)) {
+          newImports.push(this);
           parsedCount++;
           checkDone();
         } else {
@@ -1041,8 +1199,8 @@
     })();
   }
   whenReady(function(detail) {
-    HTMLImports.ready = true;
-    HTMLImports.readyTime = new Date().getTime();
+    window.HTMLImports.ready = true;
+    window.HTMLImports.readyTime = new Date().getTime();
     var evt = rootDocument.createEvent("CustomEvent");
     evt.initCustomEvent("HTMLImportsLoaded", true, true, detail);
     rootDocument.dispatchEvent(evt);
@@ -1112,10 +1270,14 @@
       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);
         }
@@ -1265,7 +1427,7 @@
   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="application/javascript"]', '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",
@@ -1316,8 +1478,9 @@
       }
     },
     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;
@@ -1378,6 +1541,8 @@
     trackElement: function(elt, callback) {
       var self = this;
       var done = function(e) {
+        elt.removeEventListener("load", done);
+        elt.removeEventListener("error", done);
         if (callback) {
           callback(e);
         }
@@ -1415,7 +1580,9 @@
       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);
@@ -1431,7 +1598,7 @@
         for (var i = 0, l = nodes.length, p = 0, 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;
             }
@@ -1454,7 +1621,7 @@
       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;
@@ -1528,7 +1695,7 @@
           }
           this.documents[url] = doc;
         }
-        elt.import = doc;
+        elt.__doc = doc;
       }
       parser.parseNext();
     },
@@ -1624,19 +1791,10 @@
   if (scope.useNative) {
     return;
   }
-  if (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;
-  }
   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();
@@ -1663,11 +1821,12 @@
   scope.addModule = addModule;
   scope.initializeModules = initializeModules;
   scope.hasNative = Boolean(document.registerElement);
-  scope.useNative = !flags.register && scope.hasNative && !window.ShadowDOMPolyfill && (!window.HTMLImports || HTMLImports.useNative);
+  scope.isIE = /Trident/.test(navigator.userAgent);
+  scope.useNative = !flags.register && scope.hasNative && !window.ShadowDOMPolyfill && (!window.HTMLImports || window.HTMLImports.useNative);
 })(window.CustomElements);
 
 window.CustomElements.addModule(function(scope) {
-  var IMPORT_LINK_TYPE = window.HTMLImports ? HTMLImports.IMPORT_LINK_TYPE : "none";
+  var IMPORT_LINK_TYPE = window.HTMLImports ? window.HTMLImports.IMPORT_LINK_TYPE : "none";
   function forSubtree(node, cb) {
     findAllElements(node, function(e) {
       if (cb(e)) {
@@ -1704,7 +1863,7 @@
     _forDocumentTree(doc, cb, []);
   }
   function _forDocumentTree(doc, cb, processingDocuments) {
-    doc = wrap(doc);
+    doc = window.wrap(doc);
     if (processingDocuments.indexOf(doc) >= 0) {
       return;
     }
@@ -1725,32 +1884,27 @@
   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) {
@@ -1769,7 +1923,7 @@
     pendingMutations = [];
   }
   function attached(element) {
-    if (hasPolyfillMutations) {
+    if (hasThrottledAttached) {
       deferMutation(function() {
         _attached(element);
       });
@@ -1778,12 +1932,10 @@
     }
   }
   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();
       }
     }
   }
@@ -1794,7 +1946,7 @@
     });
   }
   function detached(element) {
-    if (hasPolyfillMutations) {
+    if (hasThrottledAttached) {
       deferMutation(function() {
         _detached(element);
       });
@@ -1803,18 +1955,16 @@
     }
   }
   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;
@@ -1832,7 +1982,7 @@
       }
     }
   }
-  function handler(mutations) {
+  function handler(root, mutations) {
     if (flags.dom) {
       var mx = mutations[0];
       if (mx && mx.type === "childList" && mx.addedNodes) {
@@ -1847,13 +1997,14 @@
       }
       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) {
@@ -1866,16 +2017,16 @@
     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();
     }
   }
@@ -1884,7 +2035,7 @@
     if (inRoot.__observer) {
       return;
     }
-    var observer = new MutationObserver(handler);
+    var observer = new MutationObserver(handler.bind(this, inRoot));
     observer.observe(inRoot, {
       childList: true,
       subtree: true
@@ -1892,9 +2043,10 @@
     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();
   }
@@ -1905,34 +2057,38 @@
   if (originalCreateShadowRoot) {
     Element.prototype.createShadowRoot = function() {
       var root = originalCreateShadowRoot.call(this);
-      CustomElements.watchShadow(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;
 });
 
 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);
@@ -1940,8 +2096,10 @@
     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;
   }
@@ -1978,7 +2136,7 @@
 });
 
 window.CustomElements.addModule(function(scope) {
-  var isIE11OrOlder = scope.isIE11OrOlder;
+  var isIE = scope.isIE;
   var upgradeDocumentTree = scope.upgradeDocumentTree;
   var upgradeAll = scope.upgradeAll;
   var upgradeWithDefinition = scope.upgradeWithDefinition;
@@ -2069,17 +2227,23 @@
       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;
     }
   }
@@ -2141,6 +2305,9 @@
   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) {
@@ -2165,7 +2332,7 @@
   }
   wrapDomMethodToForceUpgrade(Node.prototype, "cloneNode");
   wrapDomMethodToForceUpgrade(document, "importNode");
-  if (isIE11OrOlder) {
+  if (isIE) {
     (function() {
       var importNode = document.importNode;
       document.importNode = function() {
@@ -2193,7 +2360,7 @@
 (function(scope) {
   var useNative = scope.useNative;
   var initializeModules = scope.initializeModules;
-  var isIE11OrOlder = /Trident/.test(navigator.userAgent);
+  var isIE = scope.isIE;
   if (useNative) {
     var nop = function() {};
     scope.watchShadow = nop;
@@ -2209,89 +2376,52 @@
     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() {
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-    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));
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-      document.dispatchEvent(new CustomEvent("WebComponentsReady", {
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-      return e;
     };
-    window.CustomEvent.prototype = window.Event.prototype;
+  }
+  function bootstrap() {
+    upgradeDocumentTree(window.wrap(document));
+    window.CustomElements.ready = true;
+    var requestAnimationFrame = window.requestAnimationFrame || function(f) {
+      setTimeout(f, 16);
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+    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();
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     bootstrap();
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-    var loadEvent = window.HTMLImports && !HTMLImports.ready ? "HTMLImportsLoaded" : "DOMContentLoaded";
+    var loadEvent = window.HTMLImports && !window.HTMLImports.ready ? "HTMLImportsLoaded" : "DOMContentLoaded";
     window.addEventListener(loadEvent, bootstrap);
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-  scope.isIE11OrOlder = isIE11OrOlder;
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diff --git a/lib/webcomponents-lite.min.js b/lib/webcomponents-lite.min.js
index a193b1d..91841ee 100644
--- a/lib/webcomponents-lite.min.js
+++ b/lib/webcomponents-lite.min.js
@@ -7,7 +7,6 @@
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
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The type name is invalid.");if(d(t))throw new Error("DuplicateDefinitionError: a type with name '"+String(t)+"' is already registered");return c.prototype||(c.prototype=Object.create(HTMLElement.prototype)),c.__name=t.toLowerCase(),c.lifecycle=c.lifecycle||{},c.ancestry=i(c["extends"]),a(c),s(c),n(c.prototype),u(c.__name,c),c.ctor=l(c),c.ctor.prototype=c.prototype,c.prototype.constructor=c.ctor,e.ready&&w(document),c.ctor}function n(e){if(!e.setAttribute._polyfilled){var t=e.setAttribute;e.setAttribute=function(e,n){r.call(this,e,n,t)};var n=e.removeAttribute;e.removeAttribute=function(e){r.call(this,e,null,n)},e.setAttribute._polyfilled=!0}}function r(e,t,n){e=e.toLowerCase();var r=this.getAttribute(e);n.apply(this,arguments);var o=this.getAttribute(e);this.attributeChangedCallback&&o!==r&&this.attributeChangedCallback(e,r,o)}function o(e){for(var t=0;t<E.length;t++)if(e===E[t])return!0}function i(e){var t=d(e);return t?i(t["extends"]).concat([t]):[]}function a(e){for(var t,n=e["extends"],r=0;t=e.ancestry[r];r++)n=t.is&&t.tag;e.tag=n||e.__name,n&&(e.is=e.__name)}function s(e){if(!Object.__proto__){var t=HTMLElement.prototype;if(e.is){var n=document.createElement(e.tag);t=Object.getPrototypeOf(n)}for(var r,o=e.prototype,i=!1;o;)o==t&&(i=!0),r=Object.getPrototypeOf(o),r&&(o.__proto__=r),o=r;i||console.warn(e.tag+" prototype not found in prototype chain for "+e.is),e["native"]=t}}function c(e){return g(M(e.tag),e)}function d(e){return e?L[e.toLowerCase()]:void 0}function u(e,t){L[e]=t}function l(e){return function(){return c(e)}}function h(e,t,n){return e===T?p(t,n):N(e,t)}function p(e,t){e&&(e=e.toLowerCase()),t&&(t=t.toLowerCase());var n=d(t||e);if(n){if(e==n.tag&&t==n.is)return new n.ctor;if(!t&&!n.is)return new n.ctor}var r;return t?(r=p(e),r.setAttribute("is",t),r):(r=M(e),e.indexOf("-")>=0&&b(r,HTMLElement),r)}function f(e,t){var n=e[t];e[t]=function(){var e=n.apply(this,arguments);return _(e),e}}var m,v=e.isIE,w=e.upgradeDocumentTree,_=e.upgradeAll,g=e.upgradeWithDefinition,b=e.implementPrototype,y=e.useNative,E=["annotation-xml","color-profile","font-face","font-face-src","font-face-uri","font-face-format","font-face-name","missing-glyph"],L={},T="http://www.w3.org/1999/xhtml",M=document.createElement.bind(document),N=document.createElementNS.bind(document);m=Object.__proto__||y?function(e,t){return e instanceof t}:function(e,t){if(e instanceof t)return!0;for(var n=e;n;){if(n===t.prototype)return!0;n=n.__proto__}return!1},f(Node.prototype,"cloneNode"),f(document,"importNode"),v&&!function(){var e=document.importNode;document.importNode=function(){var t=e.apply(document,arguments);if(t.nodeType==t.DOCUMENT_FRAGMENT_NODE){var n=document.createDocumentFragment();return n.appendChild(t),n}return t}}(),document.registerElement=t,document.createElement=p,document.createElementNS=h,e.registry=L,e["instanceof"]=m,e.reservedTagList=E,e.getRegisteredDefinition=d,document.register=document.registerElement}),function(e){function t(){i(window.wrap(document)),window.CustomElements.ready=!0;var e=window.requestAnimationFrame||function(e){setTimeout(e,16)};e(function(){setTimeout(function(){window.CustomElements.readyTime=Date.now(),window.HTMLImports&&(window.CustomElements.elapsed=window.CustomElements.readyTime-window.HTMLImports.readyTime),document.dispatchEvent(new CustomEvent("WebComponentsReady",{bubbles:!0}))})})}var n=e.useNative,r=e.initializeModules;e.isIE;if(n){var o=function(){};e.watchShadow=o,e.upgrade=o,e.upgradeAll=o,e.upgradeDocumentTree=o,e.upgradeSubtree=o,e.takeRecords=o,e["instanceof"]=function(e,t){return e instanceof t}}else r();var i=e.upgradeDocumentTree,a=e.upgradeDocument;if(window.wrap||(window.ShadowDOMPolyfill?(window.wrap=window.ShadowDOMPolyfill.wrapIfNeeded,window.unwrap=window.ShadowDOMPolyfill.unwrapIfNeeded):window.wrap=window.unwrap=function(e){return e}),window.HTMLImports&&(window.HTMLImports.__importsParsingHook=function(e){e["import"]&&a(wrap(e["import"]))}),"complete"===document.readyState||e.flags.eager)t();else if("interactive"!==document.readyState||window.attachEvent||window.HTMLImports&&!window.HTMLImports.ready){var s=window.HTMLImports&&!window.HTMLImports.ready?"HTMLImportsLoaded":"DOMContentLoaded";window.addEventListener(s,t)}else t()}(window.CustomElements),function(e){var t=document.createElement("style");t.textContent="body {transition: opacity ease-in 0.2s; } \nbody[unresolved] {opacity: 0; display: block; overflow: hidden; position: relative; } \n";var n=document.querySelector("head");n.insertBefore(t,n.firstChild)}(window.WebComponents);
\ No newline at end of file
diff --git a/lib/webcomponents.js b/lib/webcomponents.js
index 7f049ed..546067f 100644
--- a/lib/webcomponents.js
+++ b/lib/webcomponents.js
@@ -7,13 +7,14 @@
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
-// @version 0.7.3
-window.WebComponents = window.WebComponents || {};
-
-(function(scope) {
-  var flags = scope.flags || {};
+// @version 0.7.20
+(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(option) {
       var parts = option.split("=");
@@ -51,8 +52,8 @@
     };
     window.CustomElements.flags.register = flags.register;
   }
-  scope.flags = flags;
-})(WebComponents);
+  WebComponents.flags = flags;
+})();
 
 if (WebComponents.flags.shadow) {
   if (typeof WeakMap === "undefined") {
@@ -351,6 +352,7 @@
         });
       });
     }
+    scope.addForwardingProperties = addForwardingProperties;
     scope.assert = assert;
     scope.constructorTable = constructorTable;
     scope.defineGetter = defineGetter;
@@ -1158,6 +1160,24 @@
         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;
@@ -1781,8 +1801,8 @@
     var originalInsertBefore = OriginalNode.prototype.insertBefore;
     var originalRemoveChild = OriginalNode.prototype.removeChild;
     var originalReplaceChild = OriginalNode.prototype.replaceChild;
-    var isIe = /Trident|Edge/.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) {
@@ -2752,7 +2772,7 @@
         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;
@@ -3159,18 +3179,29 @@
     "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;
     }
-    defineWrapGetter(SVGElement, "ownerSVGElement");
+    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) {
@@ -3276,6 +3307,7 @@
   })(window.ShadowDOMPolyfill);
   (function(scope) {
     "use strict";
+    var addForwardingProperties = scope.addForwardingProperties;
     var mixin = scope.mixin;
     var registerWrapper = scope.registerWrapper;
     var setWrapper = scope.setWrapper;
@@ -3300,6 +3332,10 @@
         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
@@ -3309,20 +3345,27 @@
   })(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 DocumentFragment = registerObject(document.createDocumentFragment());
+    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;
-    scope.wrappers.DocumentFragment = DocumentFragment;
   })(window.ShadowDOMPolyfill);
   (function(scope) {
     "use strict";
@@ -3336,6 +3379,7 @@
     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) {
@@ -3368,6 +3412,28 @@
       },
       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);
+        if (activeElement === this.host) {
+          return null;
+        }
+        while (!this.contains(activeElement) && !this.host.contains(activeElement)) {
+          while (activeElement.parentNode) {
+            activeElement = activeElement.parentNode;
+          }
+          if (activeElement.host) {
+            activeElement = activeElement.host;
+          } else {
+            return null;
+          }
+        }
+        return activeElement;
       }
     });
     scope.wrappers.ShadowRoot = ShadowRoot;
@@ -3955,7 +4021,7 @@
         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();
@@ -4026,6 +4092,7 @@
     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;
@@ -4049,6 +4116,22 @@
     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() {
@@ -5379,9 +5462,12 @@
     };
   }
   scope.URL = jURL;
-})(this);
+})(self);
 
 (function(global) {
+  if (global.JsMutationObserver) {
+    return;
+  }
   var registrationsTable = new WeakMap();
   var setImmediate;
   if (/Trident|Edge/.test(navigator.userAgent)) {
@@ -5677,8 +5763,83 @@
     }
   };
   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: {}
@@ -5689,19 +5850,19 @@
   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
   };
   Object.defineProperty(document, "_currentScript", currentScriptDescriptor);
   Object.defineProperty(rootDocument, "_currentScript", currentScriptDescriptor);
-  var isIE = /Trident|Edge/.test(navigator.userAgent);
+  var isIE = /Trident/.test(navigator.userAgent);
   function whenReady(callback, doc) {
     doc = doc || rootDocument;
     whenDocumentReady(function() {
@@ -5755,6 +5916,7 @@
     if (importCount) {
       for (var i = 0, imp; i < importCount && (imp = imports[i]); i++) {
         if (isImportLoaded(imp)) {
+          newImports.push(this);
           parsedCount++;
           checkDone();
         } else {
@@ -5810,8 +5972,8 @@
     })();
   }
   whenReady(function(detail) {
-    HTMLImports.ready = true;
-    HTMLImports.readyTime = new Date().getTime();
+    window.HTMLImports.ready = true;
+    window.HTMLImports.readyTime = new Date().getTime();
     var evt = rootDocument.createEvent("CustomEvent");
     evt.initCustomEvent("HTMLImportsLoaded", true, true, detail);
     rootDocument.dispatchEvent(evt);
@@ -5881,10 +6043,14 @@
       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);
         }
@@ -6034,7 +6200,7 @@
   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="application/javascript"]', '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",
@@ -6085,8 +6251,9 @@
       }
     },
     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;
@@ -6147,6 +6314,8 @@
     trackElement: function(elt, callback) {
       var self = this;
       var done = function(e) {
+        elt.removeEventListener("load", done);
+        elt.removeEventListener("error", done);
         if (callback) {
           callback(e);
         }
@@ -6184,7 +6353,9 @@
       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);
@@ -6200,7 +6371,7 @@
         for (var i = 0, l = nodes.length, p = 0, 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;
             }
@@ -6223,7 +6394,7 @@
       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;
@@ -6297,7 +6468,7 @@
           }
           this.documents[url] = doc;
         }
-        elt.import = doc;
+        elt.__doc = doc;
       }
       parser.parseNext();
     },
@@ -6393,19 +6564,10 @@
   if (scope.useNative) {
     return;
   }
-  if (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;
-  }
   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();
@@ -6432,11 +6594,12 @@
   scope.addModule = addModule;
   scope.initializeModules = initializeModules;
   scope.hasNative = Boolean(document.registerElement);
-  scope.useNative = !flags.register && scope.hasNative && !window.ShadowDOMPolyfill && (!window.HTMLImports || HTMLImports.useNative);
+  scope.isIE = /Trident/.test(navigator.userAgent);
+  scope.useNative = !flags.register && scope.hasNative && !window.ShadowDOMPolyfill && (!window.HTMLImports || window.HTMLImports.useNative);
 })(window.CustomElements);
 
 window.CustomElements.addModule(function(scope) {
-  var IMPORT_LINK_TYPE = window.HTMLImports ? HTMLImports.IMPORT_LINK_TYPE : "none";
+  var IMPORT_LINK_TYPE = window.HTMLImports ? window.HTMLImports.IMPORT_LINK_TYPE : "none";
   function forSubtree(node, cb) {
     findAllElements(node, function(e) {
       if (cb(e)) {
@@ -6473,7 +6636,7 @@
     _forDocumentTree(doc, cb, []);
   }
   function _forDocumentTree(doc, cb, processingDocuments) {
-    doc = wrap(doc);
+    doc = window.wrap(doc);
     if (processingDocuments.indexOf(doc) >= 0) {
       return;
     }
@@ -6494,32 +6657,27 @@
   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) {
@@ -6538,7 +6696,7 @@
     pendingMutations = [];
   }
   function attached(element) {
-    if (hasPolyfillMutations) {
+    if (hasThrottledAttached) {
       deferMutation(function() {
         _attached(element);
       });
@@ -6547,12 +6705,10 @@
     }
   }
   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();
       }
     }
   }
@@ -6563,7 +6719,7 @@
     });
   }
   function detached(element) {
-    if (hasPolyfillMutations) {
+    if (hasThrottledAttached) {
       deferMutation(function() {
         _detached(element);
       });
@@ -6572,18 +6728,16 @@
     }
   }
   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;
@@ -6601,7 +6755,7 @@
       }
     }
   }
-  function handler(mutations) {
+  function handler(root, mutations) {
     if (flags.dom) {
       var mx = mutations[0];
       if (mx && mx.type === "childList" && mx.addedNodes) {
@@ -6616,13 +6770,14 @@
       }
       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) {
@@ -6635,16 +6790,16 @@
     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();
     }
   }
@@ -6653,7 +6808,7 @@
     if (inRoot.__observer) {
       return;
     }
-    var observer = new MutationObserver(handler);
+    var observer = new MutationObserver(handler.bind(this, inRoot));
     observer.observe(inRoot, {
       childList: true,
       subtree: true
@@ -6661,9 +6816,10 @@
     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();
   }
@@ -6674,34 +6830,38 @@
   if (originalCreateShadowRoot) {
     Element.prototype.createShadowRoot = function() {
       var root = originalCreateShadowRoot.call(this);
-      CustomElements.watchShadow(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;
 });
 
 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);
@@ -6709,8 +6869,10 @@
     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;
   }
@@ -6747,7 +6909,7 @@
 });
 
 window.CustomElements.addModule(function(scope) {
-  var isIE11OrOlder = scope.isIE11OrOlder;
+  var isIE = scope.isIE;
   var upgradeDocumentTree = scope.upgradeDocumentTree;
   var upgradeAll = scope.upgradeAll;
   var upgradeWithDefinition = scope.upgradeWithDefinition;
@@ -6838,17 +7000,23 @@
       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;
     }
   }
@@ -6910,6 +7078,9 @@
   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) {
@@ -6934,7 +7105,7 @@
   }
   wrapDomMethodToForceUpgrade(Node.prototype, "cloneNode");
   wrapDomMethodToForceUpgrade(document, "importNode");
-  if (isIE11OrOlder) {
+  if (isIE) {
     (function() {
       var importNode = document.importNode;
       document.importNode = function() {
@@ -6962,7 +7133,7 @@
 (function(scope) {
   var useNative = scope.useNative;
   var initializeModules = scope.initializeModules;
-  var isIE11OrOlder = /Trident/.test(navigator.userAgent);
+  var isIE = scope.isIE;
   if (useNative) {
     var nop = function() {};
     scope.watchShadow = nop;
@@ -6978,52 +7149,50 @@
     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 (isIE11OrOlder && typeof window.CustomEvent !== "function") {
-    window.CustomEvent = function(inType, params) {
-      params = params || {};
-      var e = document.createEvent("CustomEvent");
-      e.initCustomEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable), params.detail);
-      return e;
     };
-    window.CustomEvent.prototype = window.Event.prototype;
+  }
+  function bootstrap() {
+    upgradeDocumentTree(window.wrap(document));
+    window.CustomElements.ready = true;
+    var requestAnimationFrame = window.requestAnimationFrame || function(f) {
+      setTimeout(f, 16);
+    };
+    requestAnimationFrame(function() {
+      setTimeout(function() {
+        window.CustomElements.readyTime = Date.now();
+        if (window.HTMLImports) {
+          window.CustomElements.elapsed = window.CustomElements.readyTime - window.HTMLImports.readyTime;
+        }
+        document.dispatchEvent(new CustomEvent("WebComponentsReady", {
+          bubbles: true
+        }));
+      });
+    });
   }
   if (document.readyState === "complete" || scope.flags.eager) {
     bootstrap();
   } else if (document.readyState === "interactive" && !window.attachEvent && (!window.HTMLImports || window.HTMLImports.ready)) {
     bootstrap();
   } else {
-    var loadEvent = window.HTMLImports && !HTMLImports.ready ? "HTMLImportsLoaded" : "DOMContentLoaded";
+    var loadEvent = window.HTMLImports && !window.HTMLImports.ready ? "HTMLImportsLoaded" : "DOMContentLoaded";
     window.addEventListener(loadEvent, bootstrap);
   }
-  scope.isIE11OrOlder = isIE11OrOlder;
 })(window.CustomElements);
 
 (function(scope) {
@@ -7041,66 +7210,6 @@
 })(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");
diff --git a/lib/webcomponents.min.js b/lib/webcomponents.min.js
index fa95841..d7127e5 100644
--- a/lib/webcomponents.min.js
+++ b/lib/webcomponents.min.js
@@ -7,9 +7,8 @@
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
-// @version 0.7.3
-window.WebComponents=window.WebComponents||{},function(e){var t=e.flags||{},n="webcomponents.js",r=document.querySelector('script[src*="'+n+'"]');if(!t.noOpts){if(location.search.slice(1).split("&").forEach(function(e){var n,r=e.split("=");r[0]&&(n=r[0].match(/wc-(.+)/))&&(t[n[1]]=r[1]||!0)}),r)for(var o,i=0;o=r.attributes[i];i++)"src"!==o.name&&(t[o.name]=o.value||!0);if(t.log&&t.log.split){var a=t.log.split(",");t.log={},a.forEach(function(e){t.log[e]=!0})}else t.log={}}t.shadow=t.shadow||t.shadowdom||t.polyfill,t.shadow="native"===t.shadow?!1:t.shadow||!HTMLElement.prototype.createShadowRoot,t.register&&(window.CustomElements=window.CustomElements||{flags:{}},window.CustomElements.flags.register=t.register),e.flags=t}(WebComponents),WebComponents.flags.shadow&&("undefined"==typeof WeakMap&&!function(){var e=Object.defineProperty,t=Date.now()%1e9,n=function(){this.name="__st"+(1e9*Math.random()>>>0)+(t++ +"__")};n.prototype={set:function(t,n){var r=t[this.name];return r&&r[0]===t?r[1]=n:e(t,this.name,{value:[t,n],writable:!0}),this},get:function(e){var t;return(t=e[this.name])&&t[0]===e?t[1]:void 0},"delete":function(e){var t=e[this.name];return t&&t[0]===e?(t[0]=t[1]=void 0,!0):!1},has:function(e){var t=e[this.name];return t?t[0]===e:!1}},window.WeakMap=n}(),window.ShadowDOMPolyfill={},function(e){"use strict";function t(){if("undefined"!=typeof chrome&&chrome.app&&chrome.app.runtime)return!1;if(navigator.getDeviceStorage)return!1;try{var e=new Function("return true;");return e()}catch(t){return!1}}function n(e){if(!e)throw new Error("Assertion failed")}function r(e,t){for(var n=W(t),r=0;r<n.length;r++){var o=n[r];A(e,o,F(t,o))}return e}function o(e,t){for(var n=W(t),r=0;r<n.length;r++){var o=n[r];switch(o){case"arguments":case"caller":case"length":case"name":case"prototype":case"toString":continue}A(e,o,F(t,o))}return e}function i(e,t){for(var n=0;n<t.length;n++)if(t[n]in e)return t[n]}function a(e,t,n){U.value=n,A(e,t,U)}function s(e,t){var 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diff --git a/pubspec.yaml b/pubspec.yaml
index c6fd6d0..96fe7af 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: web_components
-version: 0.12.1
+version: 0.12.2
 author: Polymer.dart Authors <web-ui-dev@dartlang.org>
 homepage: https://github.com/dart-lang/web-components/
 description: >