diff -r 000000000000 -r 6474c204b198 dom/webidl/XPathEvaluator.webidl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/webidl/XPathEvaluator.webidl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+/* -*- 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/.
+ */
+
+interface XPathExpression;
+interface XPathNSResolver;
+interface XPathResult;
+
+[Constructor]
+interface XPathEvaluator {
+  // Based on nsIDOMXPathEvaluator
+  [NewObject, Throws]
+  XPathExpression createExpression(DOMString expression,
+                                   XPathNSResolver? resolver);
+  [NewObject, Throws]
+  XPathNSResolver createNSResolver(Node? nodeResolver);
+  [Throws]
+  XPathResult evaluate(DOMString expression, Node? contextNode,
+                       XPathNSResolver? resolver, unsigned short type,
+                       XPathResult? result);
+};