Fix issue with Element not having all the required properties

src/wrappers/Element.js

@@ -126,7 +126,7 @@
   mixin(Element.prototype, ParentNodeInterface);
   mixin(Element.prototype, SelectorsInterface);
 
-  registerWrapper(OriginalElement, Element);
+  registerWrapper(OriginalElement, Element, document.createElement(null, 'x'));
 
   // TODO(arv): Export setterDirtiesAttribute and apply it to more bindings
   // that reflect attributes.

test/js/SVGElement.js

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2014 The Polymer Authors. All rights reserved.
+ * Use of this source code is goverened by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+suite('SVGElement', function() {
+
+  var SVG_NS = 'http://www.w3.org/2000/svg';
+
+  test('Basics', function() {
+    var el = document.createElementNS(SVG_NS, 'svg');
+
+    assert.equal(el.localName, 'svg');
+    assert.equal(el.tagName, 'svg');
+    assert.equal(el.namespaceURI, SVG_NS);
+    assert.instanceOf(el, SVGElement);
+    assert.instanceOf(el, Element);
+    assert.instanceOf(el, Node);
+    assert.instanceOf(el, EventTarget);
+    assert.notInstanceOf(el, HTMLElement);
+  });
+
+  test('Basics innerHTML', function() {
+    var div = document.createElement('div');
+    div.innerHTML = '<svg></svg>';
+    var el = div.firstChild;
+
+    assert.equal(el.localName, 'svg');
+    assert.equal(el.tagName, 'svg');
+    assert.equal(el.namespaceURI, SVG_NS);
+    assert.instanceOf(el, SVGElement);
+    assert.instanceOf(el, Element);
+    assert.instanceOf(el, Node);
+    assert.instanceOf(el, EventTarget);
+    assert.notInstanceOf(el, HTMLElement);
+  });
+
+  test('template', function() {
+    var el = document.createElementNS(SVG_NS, 'template');
+
+    assert.equal(el.localName, 'template');
+    assert.equal(el.tagName, 'template');
+    assert.equal(el.namespaceURI, SVG_NS);
+
+    // IE does not create an SVGElement if the local name is not a known SVG
+    // element.
+    if (!/Trident/.test(navigator.userAgent))
+      assert.instanceOf(el, SVGElement);
+
+    assert.instanceOf(el, Element);
+    assert.instanceOf(el, Node);
+    assert.instanceOf(el, EventTarget);
+    assert.notInstanceOf(el, HTMLElement);
+  });
+
+});

test/test.main.js

@@ -110,6 +110,7 @@ var modules = [
   'Node.js',
   'ParentNodeInterface.js',
   'Range.js',
+  'SVGElement.js',
   'SVGElementInstance.js',
   'ShadowRoot.js',
   'Text.js',