Added scopeSubtree(container, shouldObserve) to support element use of normal dom api under shady dom in a specific subtree.

src/lib/dom-api.html

@@ -245,7 +245,9 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
       },
 
       _addNodeToHost: function(node) {
-        var root = this._ownerShadyRootForNode(node);
+        var checkNode = node.nodeType === Node.DOCUMENT_FRAGMENT_NODE ? 
+          node.firstChild : node;
+        var root = this._ownerShadyRootForNode(checkNode);
         if (root) {
           root.host._elementAdd(node);
         }

src/standard/styling.html

@@ -20,6 +20,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
     var prepTemplate = Polymer.Base._prepTemplate;
     var prepElement = Polymer.Base._prepElement;
     var baseStampTemplate = Polymer.Base._stampTemplate;
+    var nativeShadow = Polymer.Settings.useNativeShadow;
 
     Polymer.Base.addFeature({
 
@@ -29,11 +30,11 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
         var port = Polymer.DomModule.import(this.is);
         if (this._encapsulateStyle === undefined) {
           this._encapsulateStyle = 
-            Boolean(port && !Polymer.Settings.useNativeShadow);
+            Boolean(port && !nativeShadow);
         }
         // scope css
         // NOTE: dom scoped via annotations
-        if (Polymer.Settings.useNativeShadow || this._encapsulateStyle) {
+        if (nativeShadow || this._encapsulateStyle) {
           this._scopeCss();
         }
       },
@@ -107,7 +108,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
       _scopeStyles: function(styles) {
         for (var i=0, l=styles.length, s; (i<l) && (s=styles[i]); i++) {
           // transform style if necessary and place in correct place
-          if (Polymer.Settings.useNativeShadow) {
+          if (nativeShadow) {
             if (this._template) {
               this._template.content.appendChild(s);
             }
@@ -148,6 +149,41 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
         if (this._encapsulateStyle) {
           Polymer.StyleTransformer.dom(node, this.is, this._scopeCssViaAttr, true);
         }
+      },
+
+      /**
+       * Apply style scoping to the specified `container` and all its 
+       * descendants. If `shoudlObserve` is true, changes to the container are
+       * monitored via mutation observer and scoping is applied.
+       */
+      scopeSubtree: function(container, shouldObserve) {
+        if (nativeShadow) {
+          return;
+        }
+        var self = this;
+        var scopify = function(node) {
+          if (node.nodeType === Node.ELEMENT_NODE) {
+            node.className = self._scopeElementClass(node, node.className);
+            var n$ = node.querySelectorAll('*');
+            Array.prototype.forEach.call(n$, function(n) {
+              n.className = self._scopeElementClass(n, n.className);
+            });
+          }
+        };
+        scopify(container);
+        if (shouldObserve) {
+          var mo = new MutationObserver(function(mxns) {
+            mxns.forEach(function(m) {
+              if (m.addedNodes) {
+                for (var i=0; i < m.addedNodes.length; i++) {
+                  scopify(m.addedNodes[i]);
+                }
+              }
+            });
+          });
+          mo.observe(container, {childList: true, subtree: true});
+          return mo;
+        }
       }
 
     });

src/standard/x-styling.html

@@ -17,6 +17,8 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
     var baseAttachedCallback = Polymer.Base.attachedCallback;
     var baseSerializeValueToAttribute = Polymer.Base.serializeValueToAttribute;
 
+    var nativeShadow = Polymer.Settings.useNativeShadow;
+
     // TODO(sorvell): consider if calculating properties and applying
     // styles with properties should be separate modules.
     Polymer.Base.addFeature({
@@ -133,10 +135,10 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
             style = cssText ? this._applyCustomCss(cssText) : {};
             cacheStyle(this.is, style, this._xScopeSelector, 
               this._styleProperties, s$);
-          } else if (Polymer.Settings.useNativeShadow) {
+          } else if (nativeShadow) {
             this._applyCustomCss(style.textContent);
           }
-          if (style.textContent /*&& !Polymer.Settings.useNativeShadow*/) {
+          if (style.textContent /*&& !nativeShadow*/) {
             this._applyXScopeSelector(this._xScopeSelector, old);
           }
         }
@@ -168,7 +170,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
       },
 
       _transformCss: function(cssText, callback) {
-        return Polymer.Settings.useNativeShadow ?
+        return nativeShadow ?
           Polymer.StyleUtil.toCssText(cssText, callback) : 
           Polymer.StyleTransformer.css(cssText, this.is, this.extends, callback,
             this._scopeCssViaAttr);
@@ -189,13 +191,13 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
         } else if (cssText) {
           this._customStyle = Polymer.StyleUtil.applyCss(cssText, 
             this._xScopeSelector,
-            Polymer.Settings.useNativeShadow ? this.root : null);
+            nativeShadow ? this.root : null);
         }
         return this._customStyle;
       },
 
       _applyPropertiesToRule: function(properties, rule) {
-        if (!Polymer.Settings.useNativeShadow) {
+        if (!nativeShadow) {
           this._scopifyRule(rule);
         }
         if (rule.cssText.match(CUSTOM_RULE_RX)) {
@@ -258,7 +260,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
       },
 
       _scopeElementClass: function(element, selector) {
-        if (!this._scopeCssViaAttr) {
+        if (!nativeShadow && !this._scopeCssViaAttr) {
           selector += (selector ? ' ' : '') + SCOPE_NAME + ' ' + this.is + 
             (element._xScopeSelector ? ' ' +  XSCOPE_NAME + ' ' + 
             element._xScopeSelector : '');

test/unit/styling-remote-elements.html

@@ -121,4 +121,46 @@
     is: 'x-button',
     extends: 'button'
   });
+</script>
+
+<template id="dynamic">
+  <div class="added">
+    Added
+    <div class="sub-added">
+      Sub-added
+    </div>
+    </div>
+  </div>
+</template>
+
+<dom-module id="x-dynamic-scope">
+  <style>
+    .added {
+      border: 17px solid beige;
+    }
+
+    .sub-added {
+      border: 18px solid #fafafa;
+    }
+  </style>
+  <template>
+    <div id="container"></div>
+  </template>
+</dom-module>
+<script>
+(function() {
+  var doc = document._currentScript.ownerDocument;
+  var dynamic = doc.querySelector('template#dynamic');
+
+  Polymer({
+    is: 'x-dynamic-scope',
+    ready: function() {
+      // setup node for scope watching
+      this.scopeSubtree(this.$.container, true);
+      // simulate 3rd party action by using normal dom to add to element.
+      var dom = document.importNode(dynamic.content, true);
+      this.$.container.appendChild(dom);
+    }
+  });
+})();
 </script>

test/unit/styling-remote.html

@@ -36,6 +36,8 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
   <button is="x-button"></button>
   <button class="special" is="x-button"></button>
 
+  <x-dynamic-scope></x-dynamic-scope>
+
 <script src="styling.js"></script>
 </body>
 </html>

test/unit/styling-scoped-elements.html

@@ -148,4 +148,46 @@
     is: 'x-button',
     extends: 'button'
   });
+</script>
+
+<template id="dynamic">
+  <div class="added">
+    Added
+    <div class="sub-added">
+      Sub-added
+    </div>
+    </div>
+  </div>
+</template>
+
+<dom-module id="x-dynamic-scope">
+  <style>
+    .added {
+      border: 17px solid beige;
+    }
+
+    .sub-added {
+      border: 18px solid #fafafa;
+    }
+  </style>
+  <template>
+    <div id="container"></div>
+  </template>
+</dom-module>
+<script>
+(function() {
+  var doc = document._currentScript.ownerDocument;
+  var dynamic = doc.querySelector('template#dynamic');
+
+  Polymer({
+    is: 'x-dynamic-scope',
+    ready: function() {
+      // setup node for scope watching
+      this.scopeSubtree(this.$.container, true);
+      // simulate 3rd party action by using normal dom to add to element.
+      var dom = document.importNode(dynamic.content, true);
+      this.$.container.appendChild(dom);
+    }
+  });
+})();
 </script>

test/unit/styling-scoped.html

@@ -36,6 +36,8 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
   <button is="x-button"></button>
   <button class="special" is="x-button"></button>
 
+  <x-dynamic-scope></x-dynamic-scope>
+
 <script src="styling.js"></script>
 </body>
 </html>

test/unit/styling.js

@@ -117,6 +117,14 @@ suite('scoped-styling', function() {
     assertComputed(specialButton, '11px');
   });
 
+  test('element subtree added via dom api', function() {
+    var container = document.querySelector('x-dynamic-scope').$.container;
+    var a = container.querySelector('.added');
+    assertComputed(a, '17px');
+    var b = container.querySelector('.sub-added');
+    assertComputed(b, '18px');
+  });
+
   if (window.Polymer && !Polymer.Settings.useNativeShadow) {
 
     suite('scoped-styling-shady-only', function() {
@@ -127,7 +135,7 @@ suite('scoped-styling', function() {
 
       test('styles shimmed in registration order', function() {
         var s$ = document.head.querySelectorAll('style[scope]');
-        var expected = ['x-child2', 'x-styled', 'x-button'];
+        var expected = ['x-child2', 'x-styled', 'x-button', 'x-dynamic-scope'];
         var actual = [];
         for (var i=0; i<s$.length; i++) {
           actual.push(s$[i].getAttribute('scope'));