diff --git a/CustomElements.js b/CustomElements.js
index aa358bde4..85cc7e29f 100644
--- a/CustomElements.js
+++ b/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 0.7.20
+// @version 0.7.21
 if (typeof WeakMap === "undefined") {
   (function() {
     var defineProperty = Object.defineProperty;
diff --git a/CustomElements.min.js b/CustomElements.min.js
index f79e77fa3..192d49380 100644
--- a/CustomElements.min.js
+++ b/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 0.7.20
+// @version 0.7.21
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Date.now()-t}}}window.requestAnimationFrame||(window.requestAnimationFrame=function(){var e=window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame;return e?function(t){return e(function(){t(performance.now())})}:function(e){return window.setTimeout(e,1e3/60)}}()),window.cancelAnimationFrame||(window.cancelAnimationFrame=function(){return window.webkitCancelAnimationFrame||window.mozCancelAnimationFrame||function(e){clearTimeout(e)}}());var n=function(){var e=document.createEvent("Event");return e.initEvent("foo",!0,!0),e.preventDefault(),e.defaultPrevented}();if(!n){var o=Event.prototype.preventDefault;Event.prototype.preventDefault=function(){this.cancelable&&(o.call(this),Object.defineProperty(this,"defaultPrevented",{get:function(){return!0},configurable:!0}))}}var r=/Trident/.test(navigator.userAgent);if((!window.CustomEvent||r&&"function"!=typeof window.CustomEvent)&&(window.CustomEvent=function(e,t){t=t||{};var n=document.createEvent("CustomEvent");return 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diff --git a/HTMLImports.js b/HTMLImports.js
index 53859cc83..047e5ac32 100644
--- a/HTMLImports.js
+++ b/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 0.7.20
+// @version 0.7.21
 if (typeof WeakMap === "undefined") {
   (function() {
     var defineProperty = Object.defineProperty;
@@ -948,7 +948,7 @@ window.HTMLImports.addModule(function(scope) {
       if (doc && this._mayParse.indexOf(doc) < 0) {
         this._mayParse.push(doc);
         var nodes = doc.querySelectorAll(this.parseSelectorsForNode(doc));
-        for (var i = 0, l = nodes.length, p = 0, n; i < l && (n = nodes[i]); i++) {
+        for (var i = 0, l = nodes.length, n; i < l && (n = nodes[i]); i++) {
           if (!this.isParsed(n)) {
             if (this.hasResource(n)) {
               return nodeIsImport(n) ? this.nextToParseInDoc(n.__doc, n) : n;
diff --git a/HTMLImports.min.js b/HTMLImports.min.js
index c67cc5d13..c7773e028 100644
--- a/HTMLImports.min.js
+++ b/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 0.7.20
+// @version 0.7.21
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diff --git a/MutationObserver.js b/MutationObserver.js
index 3fc9de8c2..84965e575 100644
--- a/MutationObserver.js
+++ b/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 0.7.20
+// @version 0.7.21
 if (typeof WeakMap === "undefined") {
   (function() {
     var defineProperty = Object.defineProperty;
diff --git a/MutationObserver.min.js b/MutationObserver.min.js
index a73d437f9..a50ec72ab 100644
--- a/MutationObserver.min.js
+++ b/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 0.7.20
+// @version 0.7.21
 "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 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\ No newline at end of file
diff --git a/README.md b/README.md
index 9cf692f72..01774b98a 100644
--- a/README.md
+++ b/README.md
@@ -90,11 +90,35 @@ window.addEventListener('WebComponentsReady', function(e) {
 
 ## Known Issues
 
+  * [Limited CSS encapsulation](#encapsulation)
+  * [Element wrapping / unwrapping limitations](#wrapping)
   * [Custom element's constructor property is unreliable](#constructor)
   * [Contenteditable elements do not trigger MutationObserver](#contentedit)
   * [ShadowCSS: :host-context(...):host(...) doesn't work](#hostcontext)
+  * [ShadowCSS: :host(.zot:not(.bar:nth-child(2))) doesn't work](#nestedparens)
+  * [HTML imports: document.currentScript doesn't work as expected](#currentscript)
   * [execCommand isn't supported under Shadow DOM](#execcommand)
 
+### Limited CSS encapsulation <a id="encapsulation"></a>
+Under native Shadow DOM, CSS selectors cannot cross the shadow boundary. This means document level styles don't apply to shadow roots, and styles defined within a shadow root don't apply outside of that shadow root. [Several selectors](http://www.html5rocks.com/en/tutorials/webcomponents/shadowdom-201/) are provided to be able to deal with the shadow boundary.
+
+The Shadow DOM polyfill can't prevent document styles from leaking into shadow roots. It can, however, encapsulate styles within shadow roots to some extent. This behavior isn't automatically emulated by the Shadow DOM polyfill, but it can be achieved by manually using the included ShadowCSS shim:
+
+```
+WebComponents.ShadowCSS.shimStyling( shadowRoot, scope );
+```
+
+... where `shadowRoot` is the shadow root of a DOM element, and `scope` is the name of the scope used to prefix the selectors. This removes all `<style>` elements from the shadow root, rewrites it rules using the given scope and reinserts the style as a document level stylesheet. Note that the `:host` and `:host-context` pseudo classes are also rewritten.
+
+For a full explanation on the implementation and both the possibilities and the limitations of ShadowCSS please view the documentation in the [ShadowCSS source](src/ShadowCSS/ShadowCSS.js).
+
+### Element wrapping / unwrapping limitations <a id="wrapping"></a>
+The Shadow DOM polyfill is implemented by [wrapping](http://webcomponents.org/polyfills/shadow-dom/#wrappers) DOM elements whenever possible. It does this by wrapping methods like `document.querySelector` to return wrapped DOM elements. This has a few caveats:
+   * Not _everything_ can be wrapped. For example, elements like `document`, `window`, `document.body`, `document.fullscreenElement` and others are non-configurable and thus cannot be overridden.
+   * Wrappers don't support [live NodeLists](https://developer.mozilla.org/en-US/docs/Web/API/NodeList#A_sometimes-live_collection) like `HTMLElement.childNodes` and `HTMLFormElement.elements`. All NodeLists are snapshotted upon read. See [#217](https://github.com/webcomponents/webcomponentsjs/issues/217) for an explanation.
+
+In order to work around these limitations the polyfill provides the `ShadowDOMPolyfill.wrap` and `ShadowDOMPolyfill.unwrap` methods to respectively wrap and unwrap DOM elements manually.
+
 ### Custom element's constructor property is unreliable <a id="constructor"></a>
 See [#215](https://github.com/webcomponents/webcomponentsjs/issues/215) for background.
 
@@ -119,6 +143,12 @@ don't work, despite working under native Shadow DOM. The solution is to use `pol
 polyfill-next-selector { content: '.foo :host.bar, :host.foo.bar'; }
 ```
 
+### ShadowCSS: :host(.zot:not(.bar:nth-child(2))) doesn't work <a id="nestedparens"></a>
+ShadowCSS `:host()` rules can only have (at most) 1-level of nested parentheses in its argument selector under ShadowCSS. For example, `:host(.zot)` and `:host(.zot:not(.bar))` both work, but `:host(.zot:not(.bar:nth-child(2)))` does not. 
+
+### HTML imports: document.currentScript doesn't work as expected <a id="currentscript"></a>
+In native HTML Imports, document.currentScript.ownerDocument references the import document itself. In the polyfill use document._currentScript.ownerDocument (note the underscore).
+
 ### execCommand and contenteditable isn't supported under Shadow DOM <a id="execcommand"></a>
 See [#212](https://github.com/webcomponents/webcomponentsjs/issues/212)
 
diff --git a/ShadowDOM.js b/ShadowDOM.js
index c3658c2ca..14565b2a2 100644
--- a/ShadowDOM.js
+++ b/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 0.7.20
+// @version 0.7.21
 if (typeof WeakMap === "undefined") {
   (function() {
     var defineProperty = Object.defineProperty;
@@ -3411,10 +3411,7 @@ window.ShadowDOMPolyfill = {};
       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 (!this.contains(activeElement)) {
         while (activeElement.parentNode) {
           activeElement = activeElement.parentNode;
         }
diff --git a/ShadowDOM.min.js b/ShadowDOM.min.js
index b225d92cf..5b3ca6afc 100644
--- a/ShadowDOM.min.js
+++ b/ShadowDOM.min.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 0.7.20
+// @version 0.7.21
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diff --git a/bower.json b/bower.json
index 8bcb0c1c9..7603c35ef 100644
--- a/bower.json
+++ b/bower.json
@@ -1,7 +1,7 @@
 {
   "name": "webcomponentsjs",
   "main": "webcomponents.js",
-  "version": "0.7.20",
+  "version": "0.7.21",
   "homepage": "http://webcomponents.org",
   "authors": [
     "The Polymer Authors"
diff --git a/build.log b/build.log
index 3cfec4f2c..5929e7318 100644
--- a/build.log
+++ b/build.log
@@ -1,33 +1,448 @@
 BUILD LOG
 ---------
-Build Time: 2015-12-15T17:26:55-0800
+Build Time: 2016-02-18T16:57:00-0800
 
 NODEJS INFORMATION
 ==================
-nodejs: v4.2.3
-gulp: 3.9.0
+nodejs: v5.6.0
+accepts: 1.2.13
+accessibility-developer-tools: 2.10.0
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 gulp-audit: 1.0.0
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 gulp-concat: 2.6.0
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 gulp-header: 1.7.1
-gulp-uglify: 1.5.1
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 run-sequence: 1.1.5
-web-component-tester: 4.0.2
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+util-deprecate: 1.0.2
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+wct-local: 2.0.1
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+web-component-tester: 4.2.0
+window-size: 0.1.0
+wd: 0.3.12
+which: 1.2.4
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+wrappy: 1.0.1
+write-file-atomic: 1.1.4
+ws: 1.0.1
+xmlbuilder: 4.0.0
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+xdg-basedir: 2.0.0
+xmlhttprequest-ssl: 1.5.1
+xtend: 4.0.1
+yargs: 3.10.0
+yeast: 0.1.2
+zip-stream: 0.5.2
 
 REPO REVISIONS
 ==============
-webcomponentsjs: 5f1284369eb57e94ca4e88d5d71ceaeb65d1c569
+webcomponentsjs: b76bfaa6b1b2d691745b8d38b3f242e8f17490d5
 
 BUILD HASHES
 ============
-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
+CustomElements.js: 031b018d6bbebd32ae1b3edaa04927ce5cd40dd2
+CustomElements.min.js: 14f6fd8f3a3219470eec480e8918cd8749bf792d
+HTMLImports.js: 64f26245ac687f3d1a931bb99120238716219db4
+HTMLImports.min.js: 2ec6d3c8160ae77e52e2fc48db59e6ae5f3e3f19
+MutationObserver.js: aa0881cf576808bff95dfe5195727e839d8339f8
+MutationObserver.min.js: 1eebd7ec07b9e25b345ee553395c12c040bf9535
+ShadowDOM.js: 2095e8e2c18ab30417ea6bf42bcd7550a9870e7c
+ShadowDOM.min.js: ceba42773f616863115e13a884f1b7eee344ad74
+webcomponents-lite.js: b57a7c1b0d5d01cbefef3f1938c07138045bd82e
+webcomponents-lite.min.js: 2a31c424558c9f74f708ea32098f89baf2a4dd86
+webcomponents.js: 50f3c0c3fbdb74c44d5457f9d0c82d38038d379f
+webcomponents.min.js: 7127c614ab7e4e320bfc250549af7057f804a97c
\ No newline at end of file
diff --git a/package.json b/package.json
index c1262d7d2..a67097631 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "webcomponents.js",
-  "version": "0.7.20",
+  "version": "0.7.21",
   "description": "webcomponents.js",
   "main": "webcomponents.js",
   "directories": {
diff --git a/webcomponents-lite.js b/webcomponents-lite.js
index 3a133a136..1fdb2d3ac 100644
--- a/webcomponents-lite.js
+++ b/webcomponents-lite.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 0.7.20
+// @version 0.7.21
 (function() {
   window.WebComponents = window.WebComponents || {
     flags: {}
@@ -912,14 +912,29 @@ if (typeof WeakMap === "undefined") {
   }
 })(self);
 
-if (typeof HTMLTemplateElement === "undefined") {
-  (function() {
-    var TEMPLATE_TAG = "template";
+(function() {
+  var needsTemplate = typeof HTMLTemplateElement === "undefined";
+  var needsCloning = function() {
+    if (!needsTemplate) {
+      var frag = document.createDocumentFragment();
+      var t = document.createElement("template");
+      frag.appendChild(t);
+      t.content.appendChild(document.createElement("div"));
+      var clone = frag.cloneNode(true);
+      return clone.firstChild.content.childNodes.length === 0;
+    }
+  }();
+  var TEMPLATE_TAG = "template";
+  var TemplateImpl = function() {};
+  if (needsTemplate) {
     var contentDoc = document.implementation.createHTMLDocument("template");
     var canDecorate = true;
-    HTMLTemplateElement = function() {};
-    HTMLTemplateElement.prototype = Object.create(HTMLElement.prototype);
-    HTMLTemplateElement.decorate = function(template) {
+    var templateStyle = document.createElement("style");
+    templateStyle.textContent = TEMPLATE_TAG + "{display:none;}";
+    var head = document.head;
+    head.insertBefore(templateStyle, head.firstElementChild);
+    TemplateImpl.prototype = Object.create(HTMLElement.prototype);
+    TemplateImpl.decorate = function(template) {
       if (template.content) {
         return;
       }
@@ -940,7 +955,7 @@ if (typeof HTMLTemplateElement === "undefined") {
             },
             set: function(text) {
               contentDoc.body.innerHTML = text;
-              HTMLTemplateElement.bootstrap(contentDoc);
+              TemplateImpl.bootstrap(contentDoc);
               while (this.content.firstChild) {
                 this.content.removeChild(this.content.firstChild);
               }
@@ -950,27 +965,30 @@ if (typeof HTMLTemplateElement === "undefined") {
             },
             configurable: true
           });
+          template.cloneNode = function(deep) {
+            return TemplateImpl.cloneNode(this, deep);
+          };
         } catch (err) {
           canDecorate = false;
         }
       }
-      HTMLTemplateElement.bootstrap(template.content);
+      TemplateImpl.bootstrap(template.content);
     };
-    HTMLTemplateElement.bootstrap = function(doc) {
+    TemplateImpl.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);
+        TemplateImpl.decorate(t);
       }
     };
     document.addEventListener("DOMContentLoaded", function() {
-      HTMLTemplateElement.bootstrap(document);
+      TemplateImpl.bootstrap(document);
     });
     var createElement = document.createElement;
     document.createElement = function() {
       "use strict";
       var el = createElement.apply(document, arguments);
       if (el.localName == "template") {
-        HTMLTemplateElement.decorate(el);
+        TemplateImpl.decorate(el);
       }
       return el;
     };
@@ -993,8 +1011,61 @@ if (typeof HTMLTemplateElement === "undefined") {
     function escapeData(s) {
       return s.replace(escapeDataRegExp, escapeReplace);
     }
-  })();
-}
+  }
+  if (needsTemplate || needsCloning) {
+    var nativeCloneNode = Node.prototype.cloneNode;
+    TemplateImpl.cloneNode = function(template, deep) {
+      var clone = nativeCloneNode.call(template);
+      if (this.decorate) {
+        this.decorate(clone);
+      }
+      if (deep) {
+        clone.content.appendChild(nativeCloneNode.call(template.content, true));
+        this.fixClonedDom(clone.content, template.content);
+      }
+      return clone;
+    };
+    TemplateImpl.fixClonedDom = function(clone, source) {
+      var s$ = source.querySelectorAll(TEMPLATE_TAG);
+      var t$ = clone.querySelectorAll(TEMPLATE_TAG);
+      for (var i = 0, l = t$.length, t, s; i < l; i++) {
+        s = s$[i];
+        t = t$[i];
+        if (this.decorate) {
+          this.decorate(s);
+        }
+        t.parentNode.replaceChild(s.cloneNode(true), t);
+      }
+    };
+    var originalImportNode = document.importNode;
+    Node.prototype.cloneNode = function(deep) {
+      var dom = nativeCloneNode.call(this, deep);
+      if (deep) {
+        TemplateImpl.fixClonedDom(dom, this);
+      }
+      return dom;
+    };
+    document.importNode = function(element, deep) {
+      if (element.localName === TEMPLATE_TAG) {
+        return TemplateImpl.cloneNode(element, deep);
+      } else {
+        var dom = originalImportNode.call(document, element, deep);
+        if (deep) {
+          TemplateImpl.fixClonedDom(dom, element);
+        }
+        return dom;
+      }
+    };
+    if (needsCloning) {
+      HTMLTemplateElement.prototype.cloneNode = function(deep) {
+        return TemplateImpl.cloneNode(this, deep);
+      };
+    }
+  }
+  if (needsTemplate) {
+    HTMLTemplateElement = TemplateImpl;
+  }
+})();
 
 (function(scope) {
   "use strict";
@@ -1595,7 +1666,7 @@ window.HTMLImports.addModule(function(scope) {
       if (doc && this._mayParse.indexOf(doc) < 0) {
         this._mayParse.push(doc);
         var nodes = doc.querySelectorAll(this.parseSelectorsForNode(doc));
-        for (var i = 0, l = nodes.length, p = 0, n; i < l && (n = nodes[i]); i++) {
+        for (var i = 0, l = nodes.length, n; i < l && (n = nodes[i]); i++) {
           if (!this.isParsed(n)) {
             if (this.hasResource(n)) {
               return nodeIsImport(n) ? this.nextToParseInDoc(n.__doc, n) : n;
diff --git a/webcomponents-lite.min.js b/webcomponents-lite.min.js
index 91841eec5..0741ca50b 100644
--- a/webcomponents-lite.min.js
+++ b/webcomponents-lite.min.js
@@ -7,6 +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
  */
-// @version 0.7.20
-!function(){window.WebComponents=window.WebComponents||{flags:{}};var e="webcomponents-lite.js",t=document.querySelector('script[src*="'+e+'"]'),n={};if(!n.noOpts){if(location.search.slice(1).split("&").forEach(function(e){var t,r=e.split("=");r[0]&&(t=r[0].match(/wc-(.+)/))&&(n[t[1]]=r[1]||!0)}),t)for(var r,o=0;r=t.attributes[o];o++)"src"!==r.name&&(n[r.name]=r.value||!0);if(n.log&&n.log.split){var i=n.log.split(",");n.log={},i.forEach(function(e){n.log[e]=!0})}else n.log={}}n.register&&(window.CustomElements=window.CustomElements||{flags:{}},window.CustomElements.flags.register=n.register),WebComponents.flags=n}(),function(e){"use strict";function t(e){return void 0!==h[e]}function n(){s.call(this),this._isInvalid=!0}function r(e){return""==e&&n.call(this),e.toLowerCase()}function o(e){var t=e.charCodeAt(0);return t>32&&127>t&&-1==[34,35,60,62,63,96].indexOf(t)?e:encodeURIComponent(e)}function i(e){var t=e.charCodeAt(0);return t>32&&127>t&&-1==[34,35,60,62,96].indexOf(t)?e:encodeURIComponent(e)}function a(e,a,s){function c(e){g.push(e)}var d=a||"scheme start",u=0,l="",w=!1,_=!1,g=[];e:for(;(e[u-1]!=f||0==u)&&!this._isInvalid;){var b=e[u];switch(d){case"scheme start":if(!b||!m.test(b)){if(a){c("Invalid scheme.");break e}l="",d="no scheme";continue}l+=b.toLowerCase(),d="scheme";break;case"scheme":if(b&&v.test(b))l+=b.toLowerCase();else{if(":"!=b){if(a){if(f==b)break e;c("Code point not allowed in scheme: "+b);break e}l="",u=0,d="no scheme";continue}if(this._scheme=l,l="",a)break e;t(this._scheme)&&(this._isRelative=!0),d="file"==this._scheme?"relative":this._isRelative&&s&&s._scheme==this._scheme?"relative or authority":this._isRelative?"authority first slash":"scheme data"}break;case"scheme data":"?"==b?(this._query="?",d="query"):"#"==b?(this._fragment="#",d="fragment"):f!=b&&"	"!=b&&"\n"!=b&&"\r"!=b&&(this._schemeData+=o(b));break;case"no scheme":if(s&&t(s._scheme)){d="relative";continue}c("Missing 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path";continue}this._host=s._host,this._port=s._port,this._path=s._path.slice(),this._query=s._query,this._fragment="#",this._username=s._username,this._password=s._password,d="fragment"}break;case"relative slash":if("/"!=b&&"\\"!=b){"file"!=this._scheme&&(this._host=s._host,this._port=s._port,this._username=s._username,this._password=s._password),d="relative path";continue}"\\"==b&&c("\\ is an invalid code point."),d="file"==this._scheme?"file host":"authority ignore slashes";break;case"authority first slash":if("/"!=b){c("Expected '/', got: "+b),d="authority ignore slashes";continue}d="authority second slash";break;case"authority second slash":if(d="authority ignore slashes","/"!=b){c("Expected '/', got: "+b);continue}break;case"authority ignore slashes":if("/"!=b&&"\\"!=b){d="authority";continue}c("Expected authority, got: "+b);break;case"authority":if("@"==b){w&&(c("@ already seen."),l+="%40"),w=!0;for(var L=0;L<l.length;L++){var T=l[L];if("	"!=T&&"\n"!=T&&"\r"!=T)if(":"!=T||null!==this._password){var M=o(T);null!==this._password?this._password+=M:this._username+=M}else this._password="";else c("Invalid whitespace in authority.")}l=""}else{if(f==b||"/"==b||"\\"==b||"?"==b||"#"==b){u-=l.length,l="",d="host";continue}l+=b}break;case"file host":if(f==b||"/"==b||"\\"==b||"?"==b||"#"==b){2!=l.length||!m.test(l[0])||":"!=l[1]&&"|"!=l[1]?0==l.length?d="relative path start":(this._host=r.call(this,l),l="",d="relative path start"):d="relative path";continue}"	"==b||"\n"==b||"\r"==b?c("Invalid whitespace in file host."):l+=b;break;case"host":case"hostname":if(":"!=b||_){if(f==b||"/"==b||"\\"==b||"?"==b||"#"==b){if(this._host=r.call(this,l),l="",d="relative path start",a)break e;continue}"	"!=b&&"\n"!=b&&"\r"!=b?("["==b?_=!0:"]"==b&&(_=!1),l+=b):c("Invalid code point in host/hostname: "+b)}else if(this._host=r.call(this,l),l="",d="port","hostname"==a)break 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URL("b","http://a");u.pathname="c%20d",d="http://a/c%20d"===u.href}catch(l){}if(!d){var h=Object.create(null);h.ftp=21,h.file=0,h.gopher=70,h.http=80,h.https=443,h.ws=80,h.wss=443;var p=Object.create(null);p["%2e"]=".",p[".%2e"]="..",p["%2e."]="..",p["%2e%2e"]="..";var f=void 0,m=/[a-zA-Z]/,v=/[a-zA-Z0-9\+\-\.]/;c.prototype={toString:function(){return this.href},get href(){if(this._isInvalid)return this._url;var e="";return(""!=this._username||null!=this._password)&&(e=this._username+(null!=this._password?":"+this._password:"")+"@"),this.protocol+(this._isRelative?"//"+e+this.host:"")+this.pathname+this._query+this._fragment},set href(e){s.call(this),a.call(this,e)},get protocol(){return this._scheme+":"},set protocol(e){this._isInvalid||a.call(this,e+":","scheme start")},get host(){return this._isInvalid?"":this._port?this._host+":"+this._port:this._host},set host(e){!this._isInvalid&&this._isRelative&&a.call(this,e,"host")},get hostname(){return this._host},set 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diff --git a/webcomponents.js b/webcomponents.js
index 546067f18..8e9feb24c 100644
--- a/webcomponents.js
+++ b/webcomponents.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 0.7.20
+// @version 0.7.21
 (function() {
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@@ -3420,10 +3420,7 @@ if (WebComponents.flags.shadow) {
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-        }
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+        while (!this.contains(activeElement)) {
           while (activeElement.parentNode) {
             activeElement = activeElement.parentNode;
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@@ -6368,7 +6365,7 @@ window.HTMLImports.addModule(function(scope) {
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         var nodes = doc.querySelectorAll(this.parseSelectorsForNode(doc));
-        for (var i = 0, l = nodes.length, p = 0, n; i < l && (n = nodes[i]); i++) {
+        for (var i = 0, l = nodes.length, n; i < l && (n = nodes[i]); i++) {
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diff --git a/webcomponents.min.js b/webcomponents.min.js
index d7127e5d7..155ba28dd 100644
--- a/webcomponents.min.js
+++ b/webcomponents.min.js
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  */
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