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

client/html/src/SVGElementWrappingImplementation.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.
 
 class SVGElementWrappingImplementation extends ElementWrappingImplementation implements SVGElement {
   SVGElementWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
 
   factory SVGElementWrappingImplementation.tag(String tag) =>
     LevelDom.wrapSVGElement(dom.document.createElementNS(
         "http://www.w3.org/2000/svg", tag));
 
+  factory SVGElementWrappingImplementation.svg(String svg) {
+    Element parentTag;
+    final match = _START_TAG_REGEXP.firstMatch(svg);
+    if (match != null && match.group(1).toLowerCase() == 'svg') {
+      parentTag = new Element.tag('div');
+    } else {
+      parentTag = new SVGSVGElement();
+    }
+
+    parentTag.innerHTML = svg;
+    if (parentTag.elements.length == 1) return parentTag.elements[0];
+
+    throw new IllegalArgumentException('SVG had ${parentTag.elements.length} ' +
+        'top-level elements but 1 expected');
+  }
+
   String get id() { return _ptr.id; }
 
   void set id(String value) { _ptr.id = value; }
 
   SVGSVGElement get ownerSVGElement() { return LevelDom.wrapSVGSVGElement(_ptr.ownerSVGElement); }
 
   SVGElement get viewportElement() { return LevelDom.wrapSVGElement(_ptr.viewportElement); }
 
   String get xmlbase() { return _ptr.xmlbase; }
 
   void set xmlbase(String value) { _ptr.xmlbase = value; }
+
+  ElementList get elements() {
+    if (_elements == null) {
+      _elements = new FilteredElementList(this);
+    }
+    return _elements;
+  }
+
+  // TODO: The type of value should be Collection<Element>. See http://b/5392897
+  void set elements(value) {
+    final elements = this.elements;
+    elements.clear();
+    elements.addAll(value);
+  }
+
+  String get outerHTML() {
+    final container = new Element.tag("div");
+    container.elements.add(this.clone(true));
+    return container.innerHTML;
+  }
+
+  String get innerHTML() {
+    final container = new Element.tag("div");
+    container.elements.addAll(this.clone(true).elements);

[sra1, 2012/01/05 04:35:27]

This breaks the build because the static type returned by clone is Node.

dart://html/html/htmlimpl.dart:24074: "elements" is not a member of Node
 24073:     final container = new Element.tag("div");
 24074:     container.elements.addAll(this.clone(true).elements);
                                                       ~~~~~~~~

Add a .dynamic

[Jacob, 2012/01/05 16:39:48]

The better fix is to define .clone on Element as well as Node. The version for
Element should have a return type of Element rather than Node.

+    return container.innerHTML;
+  }
+
+  void set innerHTML(String svg) {
+    var container = new Element.tag("div");
+    // Wrap the SVG string in <svg> so that SVGElements are created, rather than
+    // HTMLElements.
+    container.innerHTML = '<svg version="1.1">$svg</svg>';
+    this.elements = container.elements.first.elements;
+  }
 }