diff --git a/CHANGELOG.md b/CHANGELOG.md
index 95e3c37..865b0b2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+#### 0.12.3
+  * Update to JS version
+    [0.7.21](https://github.com/webcomponents/webcomponentsjs/tree/v0.7.21).
+
 #### 0.12.2+2
 
 * Update to transformer_test `0.2.x`.
diff --git a/lib/CustomElements.js b/lib/CustomElements.js
index aa358bd..85cc7e2 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 0.7.20
+// @version 0.7.21
 if (typeof WeakMap === "undefined") {
   (function() {
     var defineProperty = Object.defineProperty;
diff --git a/lib/CustomElements.min.js b/lib/CustomElements.min.js
index f79e77f..192d493 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 0.7.20
+// @version 0.7.21
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diff --git a/lib/HTMLImports.js b/lib/HTMLImports.js
index 53859cc..047e5ac 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 0.7.20
+// @version 0.7.21
 if (typeof WeakMap === "undefined") {
   (function() {
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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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             if (this.hasResource(n)) {
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diff --git a/lib/HTMLImports.min.js b/lib/HTMLImports.min.js
index c67cc5d..c7773e0 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
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  */
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diff --git a/lib/MutationObserver.js b/lib/MutationObserver.js
index 3fc9de8..84965e5 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 0.7.20
+// @version 0.7.21
 if (typeof WeakMap === "undefined") {
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diff --git a/lib/MutationObserver.min.js b/lib/MutationObserver.min.js
index a73d437..a50ec72 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 0.7.20
+// @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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diff --git a/lib/README.md b/lib/README.md
index 9cf692f..01774b9 100644
--- a/lib/README.md
+++ b/lib/README.md
@@ -90,11 +90,35 @@
 
 ## 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 @@
 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/lib/ShadowDOM.js b/lib/ShadowDOM.js
index c3658c2..14565b2 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 0.7.20
+// @version 0.7.21
 if (typeof WeakMap === "undefined") {
   (function() {
     var defineProperty = Object.defineProperty;
@@ -3411,10 +3411,7 @@
       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/lib/ShadowDOM.min.js b/lib/ShadowDOM.min.js
index b225d92..5b3ca6a 100644
--- a/lib/ShadowDOM.min.js
+++ b/lib/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/lib/bower.json b/lib/bower.json
new file mode 100644
index 0000000..7603c35
--- /dev/null
+++ b/lib/bower.json
@@ -0,0 +1,21 @@
+{
+  "name": "webcomponentsjs",
+  "main": "webcomponents.js",
+  "version": "0.7.21",
+  "homepage": "http://webcomponents.org",
+  "authors": [
+    "The Polymer Authors"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/webcomponents/webcomponentsjs.git"
+  },
+  "keywords": [
+    "webcomponents"
+  ],
+  "license": "BSD",
+  "ignore": [],
+  "devDependencies": {
+    "web-component-tester": "^4.0.1"
+  }
+}
diff --git a/lib/build.log b/lib/build.log
index 3cfec4f..5929e73 100644
--- a/lib/build.log
+++ b/lib/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
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 gulp-concat: 2.6.0
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+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
 ============
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-webcomponents.js: 4881aa5c0dc2d730053ea701b11566cc04464738
-webcomponents.min.js: 305994efdabba100244df45ae6d86894bc69cd53
\ No newline at end of file
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+webcomponents-lite.min.js: 2a31c424558c9f74f708ea32098f89baf2a4dd86
+webcomponents.js: 50f3c0c3fbdb74c44d5457f9d0c82d38038d379f
+webcomponents.min.js: 7127c614ab7e4e320bfc250549af7057f804a97c
\ No newline at end of file
diff --git a/lib/package.json b/lib/package.json
new file mode 100644
index 0000000..a670976
--- /dev/null
+++ b/lib/package.json
@@ -0,0 +1,31 @@
+{
+  "name": "webcomponents.js",
+  "version": "0.7.21",
+  "description": "webcomponents.js",
+  "main": "webcomponents.js",
+  "directories": {
+    "test": "tests"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/webcomponents/webcomponentsjs.git"
+  },
+  "author": "The Polymer Authors",
+  "license": "BSD-3-Clause",
+  "bugs": {
+    "url": "https://github.com/webcomponents/webcomponentsjs/issues"
+  },
+  "scripts": {
+    "test": "wct"
+  },
+  "homepage": "http://webcomponents.org",
+  "devDependencies": {
+    "gulp": "^3.8.8",
+    "gulp-audit": "^1.0.0",
+    "gulp-concat": "^2.4.1",
+    "gulp-header": "^1.1.1",
+    "gulp-uglify": "^1.0.1",
+    "run-sequence": "^1.0.1",
+    "web-component-tester": "^4.0.1"
+  }
+}
diff --git a/lib/webcomponents-lite.js b/lib/webcomponents-lite.js
index 3a133a1..1fdb2d3 100644
--- a/lib/webcomponents-lite.js
+++ b/lib/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 @@
   }
 })(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 @@
             },
             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 @@
             },
             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 @@
     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 @@
       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/lib/webcomponents-lite.min.js b/lib/webcomponents-lite.min.js
index 91841ee..0741ca5 100644
--- a/lib/webcomponents-lite.min.js
+++ b/lib/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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diff --git a/lib/webcomponents.js b/lib/webcomponents.js
index 546067f..8e9feb2 100644
--- a/lib/webcomponents.js
+++ b/lib/webcomponents.js
@@ -7,7 +7,7 @@
  * Code distributed by Google as part of the polymer project is also
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  */
-// @version 0.7.20
+// @version 0.7.21
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+        for (var i = 0, l = nodes.length, n; i < l && (n = nodes[i]); i++) {
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diff --git a/lib/webcomponents.min.js b/lib/webcomponents.min.js
index d7127e5..155ba28 100644
--- a/lib/webcomponents.min.js
+++ b/lib/webcomponents.min.js
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diff --git a/pubspec.yaml b/pubspec.yaml
index fa0e1a2..c333213 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: web_components
-version: 0.12.2+3
+version: 0.12.3
 author: Polymer.dart Authors <web-ui-dev@dartlang.org>
 homepage: https://github.com/dart-lang/web-components/
 description: >