Support SVGElement#elements, #innerHTML, and #outerHTML. Also add a .svg constructor.

client/html/src/ElementWrappingImplementation.dart

 // Copyright (c) 2011, 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.
 
 // TODO(jacobr): use Lists.dart to remove some of the duplicated functionality.
 class _ChildrenElementList implements ElementList {
   // Raw Element.
   final _element;
   final _childElements;
 
@@ skipping 462 matching lines @@
 
   List<ClientRect> get clientRects() {
     final out = new List(_clientRects.length);
     for (num i = 0; i < _clientRects.length; i++) {
       out[i] = LevelDom.wrapClientRect(_clientRects.item(i));
     }
     return out;
   }
 }
 
+final _START_TAG_REGEXP = const RegExp('<(\\w+)');
+
 /** @domName Element, HTMLElement */
 class ElementWrappingImplementation extends NodeWrappingImplementation implements Element {
   
-    static final _START_TAG_REGEXP = const RegExp('<(\\w+)');
     static final _CUSTOM_PARENT_TAG_MAP = const {
       'body' : 'html',
       'head' : 'html',
       'caption' : 'table',
       'td': 'tr',
       'tbody': 'table',
       'colgroup': 'table',
       'col' : 'colgroup',
       'tr' : 'tbody',
       'tbody' : 'table',
@@ skipping 24 matching lines @@
     temp.innerHTML = html;
 
     if (temp.childElementCount == 1) {
       return LevelDom.wrapElement(temp.firstElementChild);     
     } else if (parentTag == 'html' && temp.childElementCount == 2) {
       // Work around for edge case in WebKit and possibly other browsers where
       // both body and head elements are created even though the inner html
       // only contains a head or body element.
       return LevelDom.wrapElement(temp.children.item(tag == 'head' ? 0 : 1));
     } else {
-      throw 'HTML had ${temp.childElementCount} top level elements but 1 expected';
+      throw new IllegalArgumentException('HTML had ${temp.childElementCount} ' +
+          'top level elements but 1 expected');
     }
   }
 
   /** @domName Document.createElement */
   factory ElementWrappingImplementation.tag(String tag) {
     return LevelDom.wrapElement(dom.document.createElement(tag));
   }
 
   ElementWrappingImplementation._wrap(ptr) : super._wrap(ptr);
 
@@ skipping 15 matching lines @@
 
   void set attributes(Map<String, String> value) {
     Map<String, String> attributes = this.attributes;
     attributes.clear();
     for (String key in value.getKeys()) {
       attributes[key] = value[key];
     }
   }
 
   void set elements(Collection<Element> value) {
-    // Copy list first since we don't want liveness during iteration.
-    List copy = new List.from(value);
     final elements = this.elements;
     elements.clear();
-    elements.addAll(copy);
+    elements.addAll(value);
   }
 
   /**
    * @domName childElementCount, firstElementChild, lastElementChild,
    *   children, appendChild
    */
   ElementList get elements() {
     if (_elements == null) {
       _elements = new _ChildrenElementList._wrap(_ptr);
     }
@@ skipping 176 matching lines @@
         new Completer<CSSStyleDeclaration>());
   }
 
   ElementEvents get on() {
     if (_on === null) {
       _on = new ElementEventsImplementation._wrap(_ptr);
     }
     return _on;
   }
 }