Fixing Element.matches to be cross-platform and follow latest spec.

sdk/lib/html/dart2js/html_dart2js.dart

 library html;
 
 import 'dart:collection';
 import 'dart:html_common';
 import 'dart:indexed_db';
 import 'dart:isolate';
 import 'dart:json';
 import 'dart:svg' as svg;
 import 'dart:web_audio' as web_audio;
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
@@ skipping 6165 matching lines @@
   Element get offsetParent => null;
   Element get parent => null;
   Map<String, String> get attributes => const {};
   CssClassSet get classes => new _FrozenCssClassSet();
   Map<String, String> get dataAttributes => const {};
   CssStyleDeclaration get style => new Element.tag('div').style;
   Future<CssStyleDeclaration> get computedStyle =>
       _emptyStyleFuture();
   Future<CssStyleDeclaration> getComputedStyle(String pseudoElement) =>
       _emptyStyleFuture();
-  bool matchesSelector(String selectors) => false;
 
   // Imperative Element methods are made into no-ops, as they are on parentless
   // elements.
   void blur() {}
   void focus() {}
   void click() {}
   void scrollByLines(int lines) {}
   void scrollByPages(int pages) {}
   void scrollIntoView([bool centerIfNeeded]) {}
   void webkitRequestFullScreen(int flags) {}
@@ skipping 1493 matching lines @@
         this.nodes.add(node);
         break;
       case 'afterend':
         this.parentNode.insertBefore(node, this.nextNode);
         break;
       default:
         throw new ArgumentError("Invalid position ${where}");
     }
   }
 
+  /**
+   * Checks if this element matches the CSS selectors.
+   */
+  @Experimental()
+  bool matches(String selectors) {
+    if (JS('bool', '!!#.matches', this)) {
+      return JS('bool', '#.matches(#)', this, selectors);
+    } else if (JS('bool', '!!#.webkitMatchesSelector', this)) {
+      return JS('bool', '#.webkitMatchesSelector(#)', this, selectors);
+    } else if (JS('bool', '!!#.mozMatchesSelector', this)) {
+      return JS('bool', '#.mozMatchesSelector(#)', this, selectors);
+    } else if (JS('bool', '!!#.msMatchesSelector', this)) {
+      return JS('bool', '#.msMatchesSelector(#)', this, selectors);
+    }
+  }
+
 
   /// @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent; @docsEditable true
   ElementEvents get on =>
     new ElementEvents(this);
 
   /// @domName HTMLElement.children; @docsEditable true
   @JSName('children')
   final HtmlCollection $dom_children;
 
   /// @domName HTMLElement.contentEditable; @docsEditable true
@@ skipping 191 matching lines @@
   @JSName('setAttribute')
   void $dom_setAttribute(String name, String value) native;
 
   /// @domName Element.setAttributeNS; @docsEditable true
   @JSName('setAttributeNS')
   void $dom_setAttributeNS(String namespaceURI, String qualifiedName, String value) native;
 
   /// @domName Element.webkitCreateShadowRoot; @docsEditable true
   ShadowRoot webkitCreateShadowRoot() native;
 
-  /// @domName Element.webkitMatchesSelector; @docsEditable true
-  @JSName('webkitMatchesSelector')
-  bool matchesSelector(String selectors) native;
-
   /// @domName Element.webkitRequestFullScreen; @docsEditable true
   void webkitRequestFullScreen(int flags) native;
 
   /// @domName Element.webkitRequestFullscreen; @docsEditable true
   void webkitRequestFullscreen() native;
 
   /// @domName Element.webkitRequestPointerLock; @docsEditable true
   void webkitRequestPointerLock() native;
 
 }
@@ skipping 17350 matching lines @@
   T next() {
     if (!hasNext) {
       throw new StateError("No more elements");
     }
     return _array[_pos++];
   }
 
   final List<T> _array;
   int _pos;
 }