Adding hidden HTMLElement base class back for Dart2JS

sdk/lib/html/dart2js/html_dart2js.dart

 /// The Dart HTML library.
 library dart.dom.html;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_collection-dev' hide Symbol;
 import 'dart:html_common';
 import 'dart:indexed_db';
 import 'dart:isolate';
 import 'dart:json' as json;
@@ skipping 87 matching lines @@
   @DocsEditable
   Stream<ErrorEvent> get onError => errorEvent.forTarget(this);
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLAnchorElement')
-class AnchorElement extends Element native "HTMLAnchorElement" {
+class AnchorElement extends _HTMLElement native "HTMLAnchorElement" {
 
   @DomName('HTMLAnchorElement.HTMLAnchorElement')
   @DocsEditable
   factory AnchorElement({String href}) {
     var e = document.$dom_createElement("a");
     if (href != null) e.href = href;
     return e;
   }
 
   @DomName('HTMLAnchorElement.download')
@@ skipping 236 matching lines @@
  * DOM Area Element, which links regions of an image map with a hyperlink.
  *
  * The element can also define an uninteractive region of the map.
  *
  * See also:
  *
  * * [<area>](https://developer.mozilla.org/en-US/docs/HTML/Element/area)
  * on MDN.
  */
 @DomName('HTMLAreaElement')
-class AreaElement extends Element native "HTMLAreaElement" {
+class AreaElement extends _HTMLElement native "HTMLAreaElement" {
 
   @DomName('HTMLAreaElement.HTMLAreaElement')
   @DocsEditable
   factory AreaElement() => document.$dom_createElement("area");
 
   @DomName('HTMLAreaElement.alt')
   @DocsEditable
   String alt;
 
   @DomName('HTMLAreaElement.coords')
@@ skipping 81 matching lines @@
   @DocsEditable
   final String reason;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLBRElement')
-class BRElement extends Element native "HTMLBRElement" {
+class BRElement extends _HTMLElement native "HTMLBRElement" {
 
   @DomName('HTMLBRElement.HTMLBRElement')
   @DocsEditable
   factory BRElement() => document.$dom_createElement("br");
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('BarProp')
 // http://www.whatwg.org/specs/web-apps/current-work/multipage/browsers.html#barprop
 @deprecated // standard
 class BarProp native "BarProp" {
 
   @DomName('BarProp.visible')
   @DocsEditable
   final bool visible;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLBaseElement')
-class BaseElement extends Element native "HTMLBaseElement" {
+class BaseElement extends _HTMLElement native "HTMLBaseElement" {
 
   @DomName('HTMLBaseElement.HTMLBaseElement')
   @DocsEditable
   factory BaseElement() => document.$dom_createElement("base");
 
   @DomName('HTMLBaseElement.href')
   @DocsEditable
   String href;
 
   @DomName('HTMLBaseElement.target')
@@ skipping 54 matching lines @@
   static _bag_set(bag, key, value) { JS('void', '#[#] = #', bag, key, value); }
 }
 
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLBodyElement')
-class BodyElement extends Element native "HTMLBodyElement" {
+class BodyElement extends _HTMLElement native "HTMLBodyElement" {
 
   @DomName('HTMLBodyElement.blurEvent')
   @DocsEditable
   static const EventStreamProvider<Event> blurEvent = const EventStreamProvider<Event>('blur');
 
   @DomName('HTMLBodyElement.errorEvent')
   @DocsEditable
   static const EventStreamProvider<Event> errorEvent = const EventStreamProvider<Event>('error');
 
   @DomName('HTMLBodyElement.focusEvent')
@@ skipping 88 matching lines @@
   @DocsEditable
   Stream<Event> get onUnload => unloadEvent.forTarget(this);
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLButtonElement')
-class ButtonElement extends Element native "HTMLButtonElement" {
+class ButtonElement extends _HTMLElement native "HTMLButtonElement" {
 
   @DomName('HTMLButtonElement.HTMLButtonElement')
   @DocsEditable
   factory ButtonElement() => document.$dom_createElement("button");
 
   @DomName('HTMLButtonElement.autofocus')
   @DocsEditable
   bool autofocus;
 
   @DomName('HTMLButtonElement.disabled')
@@ skipping 88 matching lines @@
   @DomName('Canvas2DContextAttributes.alpha')
   @DocsEditable
   bool alpha;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DomName('HTMLCanvasElement')
-class CanvasElement extends Element implements CanvasImageSource native "HTMLCanvasElement" {
+class CanvasElement extends _HTMLElement implements CanvasImageSource native "HTMLCanvasElement" {
 
   @DomName('HTMLCanvasElement.HTMLCanvasElement')
   @DocsEditable
   factory CanvasElement({int width, int height}) {
     var e = document.$dom_createElement("canvas");
     if (width != null) e.width = width;
     if (height != null) e.height = height;
     return e;
   }
 
@@ skipping 1001 matching lines @@
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLContentElement')
 @SupportedBrowser(SupportedBrowser.CHROME, '26')
 @Experimental
 // https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#content-element
-class ContentElement extends Element native "HTMLContentElement" {
+class ContentElement extends _HTMLElement native "HTMLContentElement" {
 
   @DomName('HTMLContentElement.HTMLContentElement')
   @DocsEditable
   factory ContentElement() => document.$dom_createElement("content");
 
   /// Checks if this type is supported on the current platform.
   static bool get supported => Element.isTagSupported('content');
 
   @DomName('HTMLContentElement.resetStyleInheritance')
   @DocsEditable
@@ skipping 4207 matching lines @@
   void $dom_initCustomEvent(String typeArg, bool canBubbleArg, bool cancelableArg, Object detailArg) native;
 
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLDListElement')
-class DListElement extends Element native "HTMLDListElement" {
+class DListElement extends _HTMLElement native "HTMLDListElement" {
 
   @DomName('HTMLDListElement.HTMLDListElement')
   @DocsEditable
   factory DListElement() => document.$dom_createElement("dl");
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLDataListElement')
 @SupportedBrowser(SupportedBrowser.CHROME)
 @SupportedBrowser(SupportedBrowser.FIREFOX)
 @SupportedBrowser(SupportedBrowser.IE, '10')
 @SupportedBrowser(SupportedBrowser.SAFARI)
-class DataListElement extends Element native "HTMLDataListElement" {
+class DataListElement extends _HTMLElement native "HTMLDataListElement" {
 
   @DomName('HTMLDataListElement.HTMLDataListElement')
   @DocsEditable
   factory DataListElement() => document.$dom_createElement("datalist");
 
   /// Checks if this type is supported on the current platform.
   static bool get supported => Element.isTagSupported('datalist');
 
   @DomName('HTMLDataListElement.options')
   @DocsEditable
@@ skipping 149 matching lines @@
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLDetailsElement')
 @SupportedBrowser(SupportedBrowser.CHROME)
 @SupportedBrowser(SupportedBrowser.SAFARI)
 @Experimental
-class DetailsElement extends Element native "HTMLDetailsElement" {
+class DetailsElement extends _HTMLElement native "HTMLDetailsElement" {
 
   @DomName('HTMLDetailsElement.HTMLDetailsElement')
   @DocsEditable
   factory DetailsElement() => document.$dom_createElement("details");
 
   /// Checks if this type is supported on the current platform.
   static bool get supported => Element.isTagSupported('details');
 
   @DomName('HTMLDetailsElement.open')
   @DocsEditable
@@ skipping 115 matching lines @@
   final num gamma;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLDialogElement')
 @Unstable
-class DialogElement extends Element native "HTMLDialogElement" {
+class DialogElement extends _HTMLElement native "HTMLDialogElement" {
 
   @DomName('HTMLDialogElement.open')
   @DocsEditable
   bool open;
 
   @DomName('HTMLDialogElement.close')
   @DocsEditable
   void close() native;
 
   @DomName('HTMLDialogElement.show')
@@ skipping 219 matching lines @@
  *     div.text = 'Here's my new DivElem
  *     document.body.elements.add(elem);
  *
  * See also:
  *
  * * [HTML <div> element](http://www.w3.org/TR/html-markup/div.html) from W3C.
  * * [Block-level element](http://www.w3.org/TR/CSS2/visuren.html#block-boxes) from W3C.
  * * [Inline-level element](http://www.w3.org/TR/CSS2/visuren.html#inline-boxes) from W3C.
  */
 @DomName('HTMLDivElement')
-class DivElement extends Element native "HTMLDivElement" {
+class DivElement extends _HTMLElement native "HTMLDivElement" {
 
   @DomName('HTMLDivElement.HTMLDivElement')
   @DocsEditable
   factory DivElement() => document.$dom_createElement("div");
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
@@ skipping 2941 matching lines @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLEmbedElement')
 @SupportedBrowser(SupportedBrowser.CHROME)
 @SupportedBrowser(SupportedBrowser.IE)
 @SupportedBrowser(SupportedBrowser.SAFARI)
 @Unstable
-class EmbedElement extends Element native "HTMLEmbedElement" {
+class EmbedElement extends _HTMLElement native "HTMLEmbedElement" {
 
   @DomName('HTMLEmbedElement.HTMLEmbedElement')
   @DocsEditable
   factory EmbedElement() => document.$dom_createElement("embed");
 
   /// Checks if this type is supported on the current platform.
   static bool get supported => Element.isTagSupported('embed');
 
   @DomName('HTMLEmbedElement.align')
   @DocsEditable
@@ skipping 647 matching lines @@
 
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLFieldSetElement')
 @Unstable
-class FieldSetElement extends Element native "HTMLFieldSetElement" {
+class FieldSetElement extends _HTMLElement native "HTMLFieldSetElement" {
 
   @DomName('HTMLFieldSetElement.HTMLFieldSetElement')
   @DocsEditable
   factory FieldSetElement() => document.$dom_createElement("fieldset");
 
   @DomName('HTMLFieldSetElement.disabled')
   @DocsEditable
   bool disabled;
 
   @DomName('HTMLFieldSetElement.elements')
@@ skipping 738 matching lines @@
   @DocsEditable
   void append(String name, value, [String filename]) native;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLFormElement')
-class FormElement extends Element native "HTMLFormElement" {
+class FormElement extends _HTMLElement native "HTMLFormElement" {
 
   @DomName('HTMLFormElement.autocompleteEvent')
   @DocsEditable
   // http://www.whatwg.org/specs/web-apps/current-work/multipage/association-of-controls-and-forms.html#autofilling-form-controls:-the-autocomplete-attribute
   @Experimental
   static const EventStreamProvider<Event> autocompleteEvent = const EventStreamProvider<Event>('autocomplete');
 
   @DomName('HTMLFormElement.autocompleteerrorEvent')
   @DocsEditable
   // http://www.whatwg.org/specs/web-apps/current-work/multipage/association-of-controls-and-forms.html#autofilling-form-controls:-the-autocomplete-attribute
@@ skipping 250 matching lines @@
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 /**
  * An `<hr>` tag.
  */
 @DomName('HTMLHRElement')
-class HRElement extends Element native "HTMLHRElement" {
+class HRElement extends _HTMLElement native "HTMLHRElement" {
 
   @DomName('HTMLHRElement.HTMLHRElement')
   @DocsEditable
   factory HRElement() => document.$dom_createElement("hr");
 }
 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // WARNING: Do not edit - generated code.
@@ skipping 32 matching lines @@
   void $dom_initHashChangeEvent(String type, bool canBubble, bool cancelable, String oldURL, String newURL) native;
 
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLHeadElement')
-class HeadElement extends Element native "HTMLHeadElement" {
+class HeadElement extends _HTMLElement native "HTMLHeadElement" {
 
   @DomName('HTMLHeadElement.HTMLHeadElement')
   @DocsEditable
   factory HeadElement() => document.$dom_createElement("head");
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLHeadingElement')
-class HeadingElement extends Element native "HTMLHeadingElement" {
+class HeadingElement extends _HTMLElement native "HTMLHeadingElement" {
 
   @DomName('HTMLHeadingElement.HTMLHeadingElement')
   @DocsEditable
   factory HeadingElement.h1() => document.$dom_createElement("h1");
 
   @DomName('HTMLHeadingElement.HTMLHeadingElement')
   @DocsEditable
   factory HeadingElement.h2() => document.$dom_createElement("h2");
 
   @DomName('HTMLHeadingElement.HTMLHeadingElement')
@@ skipping 382 matching lines @@
   // Note: used to polyfill <template>
   Document _templateContentsOwner;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLHtmlElement')
-class HtmlElement extends Element native "HTMLHtmlElement" {
+class HtmlElement extends _HTMLElement native "HTMLHtmlElement" {
 
   @DomName('HTMLHtmlElement.HTMLHtmlElement')
   @DocsEditable
   factory HtmlElement() => document.$dom_createElement("html");
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
@@ skipping 642 matching lines @@
   @DocsEditable
   Stream<ProgressEvent> get onProgress => progressEvent.forTarget(this);
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLIFrameElement')
-class IFrameElement extends Element native "HTMLIFrameElement" {
+class IFrameElement extends _HTMLElement native "HTMLIFrameElement" {
 
   @DomName('HTMLIFrameElement.HTMLIFrameElement')
   @DocsEditable
   factory IFrameElement() => document.$dom_createElement("iframe");
 
   WindowBase get contentWindow => _convertNativeToDart_Window(this._get_contentWindow);
   @JSName('contentWindow')
   @DomName('HTMLIFrameElement.contentWindow')
   @DocsEditable
   @Creates('Window|=Object')
@@ skipping 49 matching lines @@
   @DocsEditable
   final int width;
 
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DomName('HTMLImageElement')
-class ImageElement extends Element implements CanvasImageSource native "HTMLImageElement" {
+class ImageElement extends _HTMLElement implements CanvasImageSource native "HTMLImageElement" {
 
   @DomName('HTMLImageElement.HTMLImageElement')
   @DocsEditable
   factory ImageElement({String src, int width, int height}) {
     var e = document.$dom_createElement("img");
     if (src != null) e.src = src;
     if (width != null) e.width = width;
     if (height != null) e.height = height;
     return e;
   }
@@ skipping 58 matching lines @@
   @deprecated // deprecated
   final int y;
 
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DomName('HTMLInputElement')
-class InputElement extends Element implements
+class InputElement extends _HTMLElement implements
     HiddenInputElement,
     SearchInputElement,
     TextInputElement,
     UrlInputElement,
     TelephoneInputElement,
     EmailInputElement,
     PasswordInputElement,
     DateInputElement,
     MonthInputElement,
     WeekInputElement,
@@ skipping 1038 matching lines @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLKeygenElement')
 @SupportedBrowser(SupportedBrowser.CHROME)
 @SupportedBrowser(SupportedBrowser.SAFARI)
 @Experimental
 // http://www.whatwg.org/specs/web-apps/current-work/multipage/the-button-element.html#the-keygen-element
-class KeygenElement extends Element native "HTMLKeygenElement" {
+class KeygenElement extends _HTMLElement native "HTMLKeygenElement" {
 
   @DomName('HTMLKeygenElement.HTMLKeygenElement')
   @DocsEditable
   factory KeygenElement() => document.$dom_createElement("keygen");
 
   /// Checks if this type is supported on the current platform.
   static bool get supported => Element.isTagSupported('keygen') && (new Element.tag('keygen') is KeygenElement);
 
   @DomName('HTMLKeygenElement.autofocus')
   @DocsEditable
@@ skipping 50 matching lines @@
   @DocsEditable
   void setCustomValidity(String error) native;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLLIElement')
-class LIElement extends Element native "HTMLLIElement" {
+class LIElement extends _HTMLElement native "HTMLLIElement" {
 
   @DomName('HTMLLIElement.HTMLLIElement')
   @DocsEditable
   factory LIElement() => document.$dom_createElement("li");
 
   @DomName('HTMLLIElement.type')
   @DocsEditable
   // http://www.whatwg.org/specs/web-apps/current-work/multipage/obsolete.html#HTMLLIElement-partial
   @deprecated // deprecated
   String type;
 
   @DomName('HTMLLIElement.value')
   @DocsEditable
   int value;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLLabelElement')
-class LabelElement extends Element native "HTMLLabelElement" {
+class LabelElement extends _HTMLElement native "HTMLLabelElement" {
 
   @DomName('HTMLLabelElement.HTMLLabelElement')
   @DocsEditable
   factory LabelElement() => document.$dom_createElement("label");
 
   @DomName('HTMLLabelElement.control')
   @DocsEditable
   final Element control;
 
   @DomName('HTMLLabelElement.form')
   @DocsEditable
   final FormElement form;
 
   @DomName('HTMLLabelElement.htmlFor')
   @DocsEditable
   String htmlFor;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLLegendElement')
-class LegendElement extends Element native "HTMLLegendElement" {
+class LegendElement extends _HTMLElement native "HTMLLegendElement" {
 
   @DomName('HTMLLegendElement.HTMLLegendElement')
   @DocsEditable
   factory LegendElement() => document.$dom_createElement("legend");
 
   @DomName('HTMLLegendElement.form')
   @DocsEditable
   final FormElement form;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLLinkElement')
-class LinkElement extends Element native "HTMLLinkElement" {
+class LinkElement extends _HTMLElement native "HTMLLinkElement" {
 
   @DomName('HTMLLinkElement.HTMLLinkElement')
   @DocsEditable
   factory LinkElement() => document.$dom_createElement("link");
 
   @DomName('HTMLLinkElement.disabled')
   @DocsEditable
   bool disabled;
 
   @DomName('HTMLLinkElement.href')
@@ skipping 113 matching lines @@
 // http://webaudio.github.io/web-midi-api/#midierrorcallback
 @Experimental
 typedef void MidiErrorCallback(DomError error);
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLMapElement')
-class MapElement extends Element native "HTMLMapElement" {
+class MapElement extends _HTMLElement native "HTMLMapElement" {
 
   @DomName('HTMLMapElement.HTMLMapElement')
   @DocsEditable
   factory MapElement() => document.$dom_createElement("map");
 
   @DomName('HTMLMapElement.areas')
   @DocsEditable
   final HtmlCollection areas;
 
   @DomName('HTMLMapElement.name')
@@ skipping 89 matching lines @@
   void unpause() native;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLMediaElement')
 @Unstable
-class MediaElement extends Element native "HTMLMediaElement" {
+class MediaElement extends _HTMLElement native "HTMLMediaElement" {
 
   @DomName('HTMLMediaElement.canplayEvent')
   @DocsEditable
   static const EventStreamProvider<Event> canPlayEvent = const EventStreamProvider<Event>('canplay');
 
   @DomName('HTMLMediaElement.canplaythroughEvent')
   @DocsEditable
   static const EventStreamProvider<Event> canPlayThroughEvent = const EventStreamProvider<Event>('canplaythrough');
 
   @DomName('HTMLMediaElement.durationchangeEvent')
@@ skipping 1084 matching lines @@
  * An HTML <menu> element.
  *
  * A <menu> element represents an unordered list of menu commands.
  *
  * See also:
  *
  *  * [Menu Element](https://developer.mozilla.org/en-US/docs/HTML/Element/menu) from MDN.
  *  * [Menu Element](http://www.w3.org/TR/html5/the-menu-element.html#the-menu-element) from the W3C.
  */
 @DomName('HTMLMenuElement')
-class MenuElement extends Element native "HTMLMenuElement" {
+class MenuElement extends _HTMLElement native "HTMLMenuElement" {
 
   @DomName('HTMLMenuElement.HTMLMenuElement')
   @DocsEditable
   factory MenuElement() => document.$dom_createElement("menu");
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
@@ skipping 137 matching lines @@
   @DocsEditable
   Stream<MessageEvent> get onMessage => messageEvent.forTarget(this);
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLMetaElement')
-class MetaElement extends Element native "HTMLMetaElement" {
+class MetaElement extends _HTMLElement native "HTMLMetaElement" {
 
   @DomName('HTMLMetaElement.content')
   @DocsEditable
   String content;
 
   @DomName('HTMLMetaElement.httpEquiv')
   @DocsEditable
   String httpEquiv;
 
   @DomName('HTMLMetaElement.name')
@@ skipping 37 matching lines @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLMeterElement')
 @SupportedBrowser(SupportedBrowser.CHROME)
 @SupportedBrowser(SupportedBrowser.FIREFOX)
 @SupportedBrowser(SupportedBrowser.SAFARI)
 @Unstable
-class MeterElement extends Element native "HTMLMeterElement" {
+class MeterElement extends _HTMLElement native "HTMLMeterElement" {
 
   @DomName('HTMLMeterElement.HTMLMeterElement')
   @DocsEditable
   factory MeterElement() => document.$dom_createElement("meter");
 
   /// Checks if this type is supported on the current platform.
   static bool get supported => Element.isTagSupported('meter');
 
   @DomName('HTMLMeterElement.high')
   @DocsEditable
@@ skipping 274 matching lines @@
   MimeType namedItem(String name) native;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLModElement')
 @Unstable
-class ModElement extends Element native "HTMLModElement" {
+class ModElement extends _HTMLElement native "HTMLModElement" {
 
   @DomName('HTMLModElement.cite')
   @DocsEditable
   String cite;
 
   @DomName('HTMLModElement.dateTime')
   @DocsEditable
   String dateTime;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
@@ skipping 1547 matching lines @@
 // http://www.w3.org/TR/notifications/#notificationpermissioncallback
 @Experimental
 typedef void _NotificationPermissionCallback(String permission);
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLOListElement')
-class OListElement extends Element native "HTMLOListElement" {
+class OListElement extends _HTMLElement native "HTMLOListElement" {
 
   @DomName('HTMLOListElement.HTMLOListElement')
   @DocsEditable
   factory OListElement() => document.$dom_createElement("ol");
 
   @DomName('HTMLOListElement.reversed')
   @DocsEditable
   bool reversed;
 
   @DomName('HTMLOListElement.start')
   @DocsEditable
   int start;
 
   @DomName('HTMLOListElement.type')
   @DocsEditable
   String type;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLObjectElement')
 @SupportedBrowser(SupportedBrowser.CHROME)
 @SupportedBrowser(SupportedBrowser.IE)
 @SupportedBrowser(SupportedBrowser.SAFARI)
 @Unstable
-class ObjectElement extends Element native "HTMLObjectElement" {
+class ObjectElement extends _HTMLElement native "HTMLObjectElement" {
 
   @DomName('HTMLObjectElement.HTMLObjectElement')
   @DocsEditable
   factory ObjectElement() => document.$dom_createElement("object");
 
   /// Checks if this type is supported on the current platform.
   static bool get supported => Element.isTagSupported('object');
 
   @DomName('HTMLObjectElement.code')
   @DocsEditable
@@ skipping 59 matching lines @@
   @DocsEditable
   void setCustomValidity(String error) native;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLOptGroupElement')
-class OptGroupElement extends Element native "HTMLOptGroupElement" {
+class OptGroupElement extends _HTMLElement native "HTMLOptGroupElement" {
 
   @DomName('HTMLOptGroupElement.HTMLOptGroupElement')
   @DocsEditable
   factory OptGroupElement() => document.$dom_createElement("optgroup");
 
   @DomName('HTMLOptGroupElement.disabled')
   @DocsEditable
   bool disabled;
 
   @DomName('HTMLOptGroupElement.label')
   @DocsEditable
   String label;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLOptionElement')
-class OptionElement extends Element native "HTMLOptionElement" {
+class OptionElement extends _HTMLElement native "HTMLOptionElement" {
 
   @DomName('HTMLOptionElement.HTMLOptionElement')
   @DocsEditable
   factory OptionElement([String data, String value, bool defaultSelected, bool selected]) {
     if (selected != null) {
       return OptionElement._create_1(data, value, defaultSelected, selected);
     }
     if (defaultSelected != null) {
       return OptionElement._create_2(data, value, defaultSelected);
     }
@@ skipping 42 matching lines @@
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLOutputElement')
 @SupportedBrowser(SupportedBrowser.CHROME)
 @SupportedBrowser(SupportedBrowser.FIREFOX)
 @SupportedBrowser(SupportedBrowser.SAFARI)
-class OutputElement extends Element native "HTMLOutputElement" {
+class OutputElement extends _HTMLElement native "HTMLOutputElement" {
 
   @DomName('HTMLOutputElement.HTMLOutputElement')
   @DocsEditable
   factory OutputElement() => document.$dom_createElement("output");
 
   /// Checks if this type is supported on the current platform.
   static bool get supported => Element.isTagSupported('output');
 
   @DomName('HTMLOutputElement.defaultValue')
   @DocsEditable
@@ skipping 95 matching lines @@
   @DocsEditable
   final bool persisted;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLParagraphElement')
-class ParagraphElement extends Element native "HTMLParagraphElement" {
+class ParagraphElement extends _HTMLElement native "HTMLParagraphElement" {
 
   @DomName('HTMLParagraphElement.HTMLParagraphElement')
   @DocsEditable
   factory ParagraphElement() => document.$dom_createElement("p");
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLParamElement')
 @Unstable
-class ParamElement extends Element native "HTMLParamElement" {
+class ParamElement extends _HTMLElement native "HTMLParamElement" {
 
   @DomName('HTMLParamElement.HTMLParamElement')
   @DocsEditable
   factory ParamElement() => document.$dom_createElement("param");
 
   @DomName('HTMLParamElement.name')
   @DocsEditable
   String name;
 
   @DomName('HTMLParamElement.value')
@@ skipping 591 matching lines @@
 @DomName('PositionErrorCallback')
 @Unstable
 typedef void _PositionErrorCallback(PositionError error);
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLPreElement')
-class PreElement extends Element native "HTMLPreElement" {
+class PreElement extends _HTMLElement native "HTMLPreElement" {
 
   @DomName('HTMLPreElement.HTMLPreElement')
   @DocsEditable
   factory PreElement() => document.$dom_createElement("pre");
 
   @DomName('HTMLPreElement.wrap')
   @DocsEditable
   @deprecated // deprecated
   bool wrap;
 }
@@ skipping 25 matching lines @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLProgressElement')
 @SupportedBrowser(SupportedBrowser.CHROME)
 @SupportedBrowser(SupportedBrowser.FIREFOX)
 @SupportedBrowser(SupportedBrowser.IE, '10')
 @SupportedBrowser(SupportedBrowser.SAFARI)
-class ProgressElement extends Element native "HTMLProgressElement" {
+class ProgressElement extends _HTMLElement native "HTMLProgressElement" {
 
   @DomName('HTMLProgressElement.HTMLProgressElement')
   @DocsEditable
   factory ProgressElement() => document.$dom_createElement("progress");
 
   /// Checks if this type is supported on the current platform.
   static bool get supported => Element.isTagSupported('progress');
 
   @DomName('HTMLProgressElement.labels')
   @DocsEditable
@@ skipping 35 matching lines @@
   @DocsEditable
   final int total;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLQuoteElement')
-class QuoteElement extends Element native "HTMLQuoteElement" {
+class QuoteElement extends _HTMLElement native "HTMLQuoteElement" {
 
   @DomName('HTMLQuoteElement.cite')
   @DocsEditable
   String cite;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // WARNING: Do not edit - generated code.
@@ skipping 930 matching lines @@
   @DocsEditable
   final int width;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLScriptElement')
-class ScriptElement extends Element native "HTMLScriptElement" {
+class ScriptElement extends _HTMLElement native "HTMLScriptElement" {
 
   @DomName('HTMLScriptElement.HTMLScriptElement')
   @DocsEditable
   factory ScriptElement() => document.$dom_createElement("script");
 
   @DomName('HTMLScriptElement.async')
   @DocsEditable
   bool async;
 
   @DomName('HTMLScriptElement.charset')
@@ skipping 157 matching lines @@
   @DomName('SecurityPolicyViolationEvent.violatedDirective')
   @DocsEditable
   final String violatedDirective;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DomName('HTMLSelectElement')
-class SelectElement extends Element native "HTMLSelectElement" {
+class SelectElement extends _HTMLElement native "HTMLSelectElement" {
 
   @DomName('HTMLSelectElement.HTMLSelectElement')
   @DocsEditable
   factory SelectElement() => document.$dom_createElement("select");
 
   @DomName('HTMLSelectElement.autofocus')
   @DocsEditable
   bool autofocus;
 
   @DomName('HTMLSelectElement.disabled')
@@ skipping 221 matching lines @@
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLShadowElement')
 @SupportedBrowser(SupportedBrowser.CHROME, '26')
 @Experimental
 // https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#shadow-element
-class ShadowElement extends Element native "HTMLShadowElement" {
+class ShadowElement extends _HTMLElement native "HTMLShadowElement" {
 
   /// Checks if this type is supported on the current platform.
   static bool get supported => Element.isTagSupported('shadow');
 
   @DomName('HTMLShadowElement.olderShadowRoot')
   @DocsEditable
   final ShadowRoot olderShadowRoot;
 
   @DomName('HTMLShadowElement.resetStyleInheritance')
   @DocsEditable
@@ skipping 170 matching lines @@
   @DocsEditable
   void $dom_removeEventListener(String type, EventListener listener, [bool useCapture]) native;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLSourceElement')
-class SourceElement extends Element native "HTMLSourceElement" {
+class SourceElement extends _HTMLElement native "HTMLSourceElement" {
 
   @DomName('HTMLSourceElement.HTMLSourceElement')
   @DocsEditable
   factory SourceElement() => document.$dom_createElement("source");
 
   @DomName('HTMLSourceElement.media')
   @DocsEditable
   String media;
 
   @DomName('HTMLSourceElement.src')
   @DocsEditable
   String src;
 
   @DomName('HTMLSourceElement.type')
   @DocsEditable
   String type;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLSpanElement')
-class SpanElement extends Element native "HTMLSpanElement" {
+class SpanElement extends _HTMLElement native "HTMLSpanElement" {
 
   @DomName('HTMLSpanElement.HTMLSpanElement')
   @DocsEditable
   factory SpanElement() => document.$dom_createElement("span");
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
@@ skipping 879 matching lines @@
 // http://www.w3.org/TR/2011/WD-html5-20110113/dnd.html#the-datatransferitem-interface
 @Experimental
 typedef void _StringCallback(String data);
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLStyleElement')
-class StyleElement extends Element native "HTMLStyleElement" {
+class StyleElement extends _HTMLElement native "HTMLStyleElement" {
 
   @DomName('HTMLStyleElement.HTMLStyleElement')
   @DocsEditable
   factory StyleElement() => document.$dom_createElement("style");
 
   @DomName('HTMLStyleElement.disabled')
   @DocsEditable
   bool disabled;
 
   @DomName('HTMLStyleElement.media')
@@ skipping 68 matching lines @@
   @DocsEditable
   final String type;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLTableCaptionElement')
-class TableCaptionElement extends Element native "HTMLTableCaptionElement" {
+class TableCaptionElement extends _HTMLElement native "HTMLTableCaptionElement" {
 
   @DomName('HTMLTableCaptionElement.HTMLTableCaptionElement')
   @DocsEditable
   factory TableCaptionElement() => document.$dom_createElement("caption");
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLTableCellElement')
-class TableCellElement extends Element native "HTMLTableCellElement" {
+class TableCellElement extends _HTMLElement native "HTMLTableCellElement" {
 
   @DomName('HTMLTableCellElement.HTMLTableCellElement')
   @DocsEditable
   factory TableCellElement() => document.$dom_createElement("td");
 
   @DomName('HTMLTableCellElement.cellIndex')
   @DocsEditable
   final int cellIndex;
 
   @DomName('HTMLTableCellElement.colSpan')
   @DocsEditable
   int colSpan;
 
   @DomName('HTMLTableCellElement.headers')
   @DocsEditable
   String headers;
 
   @DomName('HTMLTableCellElement.rowSpan')
   @DocsEditable
   int rowSpan;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLTableColElement')
-class TableColElement extends Element native "HTMLTableColElement" {
+class TableColElement extends _HTMLElement native "HTMLTableColElement" {
 
   @DomName('HTMLTableColElement.HTMLTableColElement')
   @DocsEditable
   factory TableColElement() => document.$dom_createElement("col");
 
   @DomName('HTMLTableColElement.span')
   @DocsEditable
   int span;
 }
 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLTableElement')
-class TableElement extends Element native "HTMLTableElement" {
+class TableElement extends _HTMLElement native "HTMLTableElement" {
 
   @DomName('HTMLTableElement.tBodies')
   List<TableSectionElement> get tBodies =>
   new _WrappedList<TableSectionElement>($dom_tBodies);
 
   @DomName('HTMLTableElement.rows')
   List<TableRowElement> get rows =>
       new _WrappedList<TableRowElement>($dom_rows);
 
   TableRowElement addRow() {
@@ skipping 87 matching lines @@
   @DocsEditable
   Element $dom_insertRow(int index) native;
 }
 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLTableRowElement')
-class TableRowElement extends Element native "HTMLTableRowElement" {
+class TableRowElement extends _HTMLElement native "HTMLTableRowElement" {
 
   @DomName('HTMLTableRowElement.cells')
   List<TableCellElement> get cells =>
       new _WrappedList<TableCellElement>($dom_cells);
 
   TableCellElement addCell() {
     return insertCell(-1);
   }
 
   TableCellElement insertCell(int index) => $dom_insertCell(index);
@@ skipping 25 matching lines @@
   @DocsEditable
   Element $dom_insertCell(int index) native;
 }
 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLTableSectionElement')
-class TableSectionElement extends Element native "HTMLTableSectionElement" {
+class TableSectionElement extends _HTMLElement native "HTMLTableSectionElement" {
 
   @DomName('HTMLTableSectionElement.rows')
   List<TableRowElement> get rows =>
     new _WrappedList<TableRowElement>($dom_rows);
 
   TableRowElement addRow() {
     return insertRow(-1);
   }
 
   TableRowElement insertRow(int index) => $dom_insertRow(index);
@@ skipping 18 matching lines @@
 // BSD-style license that can be found in the LICENSE file.
 
 // WARNING: Do not edit - generated code.
 
 
 @Experimental
 @DomName('HTMLTemplateElement')
 @SupportedBrowser(SupportedBrowser.CHROME)
 @Experimental
 // https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/templates/index.html#template-element
-class TemplateElement extends Element native "HTMLTemplateElement" {
+class TemplateElement extends _HTMLElement native "HTMLTemplateElement" {
 
   @DomName('HTMLTemplateElement.HTMLTemplateElement')
   @DocsEditable
   factory TemplateElement() => document.$dom_createElement("template");
 
   /// Checks if this type is supported on the current platform.
   static bool get supported => Element.isTagSupported('template');
 
   @JSName('content')
   @DomName('HTMLTemplateElement.content')
@@ skipping 186 matching lines @@
     super.unbindAll();
   }
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLTextAreaElement')
-class TextAreaElement extends Element native "HTMLTextAreaElement" {
+class TextAreaElement extends _HTMLElement native "HTMLTextAreaElement" {
 
   @DomName('HTMLTextAreaElement.HTMLTextAreaElement')
   @DocsEditable
   factory TextAreaElement() => document.$dom_createElement("textarea");
 
   @DomName('HTMLTextAreaElement.autofocus')
   @DocsEditable
   bool autofocus;
 
   @DomName('HTMLTextAreaElement.cols')
@@ skipping 511 matching lines @@
 
 @DomName('TimeoutHandler')
 typedef void TimeoutHandler();
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLTitleElement')
-class TitleElement extends Element native "HTMLTitleElement" {
+class TitleElement extends _HTMLElement native "HTMLTitleElement" {
 
   @DomName('HTMLTitleElement.HTMLTitleElement')
   @DocsEditable
   factory TitleElement() => document.$dom_createElement("title");
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
@@ skipping 239 matching lines @@
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLTrackElement')
 @SupportedBrowser(SupportedBrowser.CHROME)
 @SupportedBrowser(SupportedBrowser.IE, '10')
 @SupportedBrowser(SupportedBrowser.SAFARI)
 // http://www.whatwg.org/specs/web-apps/current-work/multipage/the-video-element.html#the-track-element
 @Experimental
-class TrackElement extends Element native "HTMLTrackElement" {
+class TrackElement extends _HTMLElement native "HTMLTrackElement" {
 
   @DomName('HTMLTrackElement.HTMLTrackElement')
   @DocsEditable
   factory TrackElement() => document.$dom_createElement("track");
 
   /// Checks if this type is supported on the current platform.
   static bool get supported => Element.isTagSupported('track');
 
   @DomName('HTMLTrackElement.ERROR')
   @DocsEditable
@@ skipping 246 matching lines @@
   @DomName('UIEvent.pageY')
   Point get page => new Point($dom_pageX, $dom_pageY);
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLUListElement')
-class UListElement extends Element native "HTMLUListElement" {
+class UListElement extends _HTMLElement native "HTMLUListElement" {
 
   @DomName('HTMLUListElement.HTMLUListElement')
   @DocsEditable
   factory UListElement() => document.$dom_createElement("ul");
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLUnknownElement')
-class UnknownElement extends Element native "HTMLUnknownElement" {
+class UnknownElement extends _HTMLElement native "HTMLUnknownElement" {
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DomName('URL')
 class Url native "URL" {
 
   static String createObjectUrl(blob_OR_source_OR_stream) =>
@@ skipping 2719 matching lines @@
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLAppletElement')
 // http://www.whatwg.org/specs/web-apps/current-work/multipage/obsolete.html#the-applet-element
 @deprecated // deprecated
-abstract class _HTMLAppletElement extends Element native "HTMLAppletElement" {
+abstract class _HTMLAppletElement extends _HTMLElement native "HTMLAppletElement" {
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLBaseFontElement')
 // http://www.whatwg.org/specs/web-apps/current-work/multipage/obsolete.html#basefont
 @deprecated // deprecated
-abstract class _HTMLBaseFontElement extends Element native "HTMLBaseFontElement" {
+abstract class _HTMLBaseFontElement extends _HTMLElement native "HTMLBaseFontElement" {
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLDirectoryElement')
 // http://www.whatwg.org/specs/web-apps/current-work/multipage/obsolete.html#dir
 @deprecated // deprecated
-abstract class _HTMLDirectoryElement extends Element native "HTMLDirectoryElement" {
+abstract class _HTMLDirectoryElement extends _HTMLElement native "HTMLDirectoryElement" {
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLFontElement')
 // http://www.whatwg.org/specs/web-apps/current-work/multipage/obsolete.html#htmlfontelement
 @deprecated // deprecated
-abstract class _HTMLFontElement extends Element native "HTMLFontElement" {
+abstract class _HTMLFontElement extends _HTMLElement native "HTMLFontElement" {
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLFrameElement')
 // http://www.whatwg.org/specs/web-apps/current-work/multipage/obsolete.html#htmlframeelement
 @deprecated // deprecated
-abstract class _HTMLFrameElement extends Element native "HTMLFrameElement" {
+abstract class _HTMLFrameElement extends _HTMLElement native "HTMLFrameElement" {
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLFrameSetElement')
 // http://www.whatwg.org/specs/web-apps/current-work/multipage/obsolete.html#frameset
 @deprecated // deprecated
-abstract class _HTMLFrameSetElement extends Element native "HTMLFrameSetElement" {
+abstract class _HTMLFrameSetElement extends _HTMLElement native "HTMLFrameSetElement" {
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLMarqueeElement')
 // http://www.whatwg.org/specs/web-apps/current-work/multipage/obsolete.html#the-marquee-element
 @deprecated // deprecated
-abstract class _HTMLMarqueeElement extends Element native "HTMLMarqueeElement" {
+abstract class _HTMLMarqueeElement extends _HTMLElement native "HTMLMarqueeElement" {
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('NamedNodeMap')
 // http://dom.spec.whatwg.org/#namednodemap
 @deprecated // deprecated
@@ skipping 4764 matching lines @@
       _position = nextPosition;
       return true;
     }
     _current = null;
     _position = _array.length;
     return false;
   }
 
   T get current => _current;
 }