Add dummy dart:html library for documentation.

lib/html/doc/interface/SVGEllipseElement.dartdoc

Index: lib/html/doc/interface/SVGEllipseElement.dartdoc
diff --git a/lib/html/doc/interface/SVGEllipseElement.dartdoc b/lib/html/doc/interface/SVGEllipseElement.dartdoc
new file mode 100644
index 0000000000000000000000000000000000000000..ee55cca9a3afa74e9f3dc514b76a2f0d564ef291
--- /dev/null
+++ b/lib/html/doc/interface/SVGEllipseElement.dartdoc
@@ -0,0 +1,23 @@
+// 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.
+
+// WARNING:
+//   This file contains documentation that is merged into the real source.
+//   Do not make code changes here.
+
+/// @domName SVGEllipseElement
+interface SVGEllipseElement extends SVGElement, SVGTests, SVGLangSpace, SVGExternalResourcesRequired, SVGStylable, SVGTransformable {
+
+  /** @domName SVGEllipseElement.cx */
+  final SVGAnimatedLength cx;
+
+  /** @domName SVGEllipseElement.cy */
+  final SVGAnimatedLength cy;
+
+  /** @domName SVGEllipseElement.rx */
+  final SVGAnimatedLength rx;
+
+  /** @domName SVGEllipseElement.ry */
+  final SVGAnimatedLength ry;
+}