'extends Element'

tools/dom/templates/html/dart2js/html_dart2js.darttemplate

 // 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.
 
 // DO NOT EDIT - unless you are editing documentation as per:
 // https://code.google.com/p/dart/wiki/ContributingHTMLDocumentation
 // Auto-generated dart:html library.
 
 /// The Dart HTML library.
 ///
 /// For examples, see
 /// [Dart HTML5 Samples](https://github.com/dart-lang/dart-html5-samples)
 /// on Github.
 library dart.dom.html;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_collection-dev' hide Symbol, deprecated;
 import 'dart:html_common';
 import 'dart:indexed_db';
 import 'dart:isolate';
 import 'dart:json' as json;
 import 'dart:math';
 import 'dart:typed_data';
 // Not actually used, but imported since dart:html can generate these objects.
 import 'dart:svg' as svg;
 import 'dart:web_audio' as web_audio;
 import 'dart:web_gl' as gl;
 import 'dart:web_sql';
-import 'dart:_js_helper' show convertDartClosureToJS, Creates, JavaScriptIndexingBehavior, JSName, Null, Returns;
-import 'dart:_interceptors' show Interceptor, JSExtendableArray;
+import 'dart:_js_helper' show
+    convertDartClosureToJS, Creates, JavaScriptIndexingBehavior,
+    JSName, Null, Returns,
+    findDispatchTagForInterceptorClass, setNativeSubclassDispatchRecord;
+import 'dart:_interceptors' show
+    Interceptor, JSExtendableArray, findInterceptorConstructorForType;
 import 'dart:_isolate_helper' show IsolateNatives;
 import 'dart:_foreign_helper' show JS;
 
 $!GENERATED_DART_FILES
 
 part '$AUXILIARY_DIR/AttributeMap.dart';
 part '$AUXILIARY_DIR/CanvasImageSource.dart';
 part '$AUXILIARY_DIR/CrossFrameTypes.dart';
 part '$AUXILIARY_DIR/CssClassSet.dart';
 part '$AUXILIARY_DIR/CssRectangle.dart';
 part '$AUXILIARY_DIR/Dimension.dart';
 part '$AUXILIARY_DIR/EventListener.dart';
 part '$AUXILIARY_DIR/EventStreamProvider.dart';
 part '$AUXILIARY_DIR/ImmutableListMixin.dart';
 part '$AUXILIARY_DIR/KeyboardEventStream.dart';
 part '$AUXILIARY_DIR/KeyCode.dart';
 part '$AUXILIARY_DIR/KeyLocation.dart';
 part '$AUXILIARY_DIR/KeyName.dart';
 part '$AUXILIARY_DIR/Point.dart';
 part '$AUXILIARY_DIR/ReadyState.dart';
 part '$AUXILIARY_DIR/Rectangle.dart';
 part '$AUXILIARY_DIR/_HttpRequestUtils.dart';
 part '$AUXILIARY_DIR/Isolates.dart';
 part '$AUXILIARY_DIR/Microtask.dart';
 part '$AUXILIARY_DIR/Serialization.dart';
 part '$AUXILIARY_DIR/WrappedEvent.dart';
 part '$AUXILIARY_DIR/WrappedList.dart';
 part '$AUXILIARY_DIR/dart2js_Conversions.dart';
+part '$AUXILIARY_DIR/dart2js_CustomElementSupport.dart';
 part '$AUXILIARY_DIR/dart2js_DOMImplementation.dart';
 part '$AUXILIARY_DIR/dart2js_KeyEvent.dart';
 part '$AUXILIARY_DIR/dart2js_LocationWrapper.dart';
 part '$AUXILIARY_DIR/dart2js_Platform.dart';
 part '$AUXILIARY_DIR/_ListIterators.dart';
 
 
 /**
  * Top-level container for a web page, which is usually a browser tab or window.
  *
@@ skipping 31 matching lines @@
   return JS('int', r'window.$dart$isolate$counter++');
 }
 
 // Fast path to invoke JS send port.
 _callPortSync(int id, message) {
   return JS('var', r'ReceivePortSync.dispatchCall(#, #)', id, message);
 }
 
 Future<SendPort> spawnDomFunction(Function f) =>
   new Future.value(IsolateNatives.spawnDomFunction(f));