diff -r 000000000000 -r 6474c204b198 dom/interfaces/core/nsIDOMDocumentFragment.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/interfaces/core/nsIDOMDocumentFragment.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,27 @@
+/* -*- 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/. */
+
+#include "nsIDOMNode.idl"
+    
+/**
+ * DocumentFragment is a "lightweight" or "minimal" Document object.
+ * nsIDOMDocumentFragment is used in situations where the Document
+ * interface can potentially be a heavyweight interface.
+ *
+ * For more information on this interface please see 
+ * http://www.w3.org/TR/DOM-Level-2-Core/
+ */
+
+[scriptable, builtinclass, uuid(75a237af-133e-40f0-8196-2a172867c41a)]
+interface nsIDOMDocumentFragment : nsIDOMNode
+{
+  /**
+   * Return nodes that match a given CSS selector.
+   *
+   * @see <http://dev.w3.org/2006/webapi/selectors-api/>
+   */
+  nsIDOMElement querySelector([Null(Stringify)] in DOMString selectors);
+  nsIDOMNodeList querySelectorAll([Null(Stringify)] in DOMString selectors);
+};