diff -r 000000000000 -r 6474c204b198 dom/webidl/MutationObserver.webidl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/webidl/MutationObserver.webidl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,61 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org
+ */
+
+interface MutationRecord {
+  [Constant]
+  readonly attribute DOMString type;
+  // .target is not nullable per the spec, but in order to prevent crashes,
+  // if there are GC/CC bugs in Gecko, we let the property to be null.
+  [Constant]
+  readonly attribute Node? target;
+  [Constant]
+  readonly attribute NodeList addedNodes;
+  [Constant]
+  readonly attribute NodeList removedNodes;
+  [Constant]
+  readonly attribute Node? previousSibling;
+  [Constant]
+  readonly attribute Node? nextSibling;
+  [Constant]
+  readonly attribute DOMString? attributeName;
+  [Constant]
+  readonly attribute DOMString? attributeNamespace;
+  [Constant]
+  readonly attribute DOMString? oldValue;
+};
+
+[Constructor(MutationCallback mutationCallback)]
+interface MutationObserver {
+  [Throws]
+  void observe(Node target, optional MutationObserverInit options);
+  void disconnect();
+  sequence<MutationRecord> takeRecords();
+
+  [ChromeOnly]
+  sequence<MutationObservingInfo?> getObservingInfo();
+  [ChromeOnly]
+  readonly attribute MutationCallback mutationCallback;
+};
+
+callback MutationCallback = void (sequence<MutationRecord> mutations, MutationObserver observer);
+
+dictionary MutationObserverInit {
+  boolean childList = false;
+  boolean attributes = false;
+  boolean characterData = false;
+  boolean subtree = false;
+  boolean attributeOldValue = false;
+  boolean characterDataOldValue = false;
+  sequence<DOMString> attributeFilter;
+};
+
+dictionary MutationObservingInfo : MutationObserverInit
+{
+  Node? observedNode = null;
+};