Properly type the clone method for Element and a few of its subclasses.

client/html/release/html.dart

 #library('html');
 
 #import('dart:dom', prefix:'dom');
 #import('dart:htmlimpl');
 // 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.
 
 // DO NOT EDIT
 // Auto-generated Dart HTML library.
@@ skipping 11386 matching lines @@
 }
 // 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.
 
 interface DocumentFragment extends Element default DocumentFragmentWrappingImplementation {
  
   DocumentFragment();
 
   DocumentFragment.html(String html);
+
+  DocumentFragment clone(bool deep);
 }
 // 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.
 
 interface DOMApplicationCacheEvents extends Events {
   EventListenerList get cached();
   EventListenerList get checking();
   EventListenerList get downloading();
   EventListenerList get error();
@@ skipping 212 matching lines @@
 
   bool matchesSelector([String selectors]);
 
   Future<ElementRect> get rect();
 
   Future<CSSStyleDeclaration> get computedStyle();
 
   Future<CSSStyleDeclaration> getComputedStyle(String pseudoElement);
 
   ElementEvents get on();
+
+  Element clone(bool deep);
 }
 // 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.
 
 interface ErrorEvent extends Event default ErrorEventWrappingImplementation {
 
   ErrorEvent(String type, String message, String filename, int lineNo,
       [bool canBubble, bool cancelable]);
 
@@ skipping 1109 matching lines @@
 
   void set id(String value);
 
   SVGSVGElement get ownerSVGElement();
 
   SVGElement get viewportElement();
 
   String get xmlbase();
 
   void set xmlbase(String value);
+
+  SVGElement clone(bool deep);
 }
 // 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.
 
 // WARNING: Do not edit - generated code.
 
 interface SVGElementInstance extends EventTarget {
 
   SVGElementInstanceList get childNodes();
@@ skipping 708 matching lines @@
   EventListenerList get abort();
   EventListenerList get error();
   EventListenerList get load();
   EventListenerList get loadStart();
   EventListenerList get progress();
 }
 
 interface XMLHttpRequestUpload extends EventTarget {
   XMLHttpRequestUploadEvents get on();
 }