Sync XML-related interfaces with their specs, or lack thereof

Source/core/xml/DocumentXPathEvaluator.idl

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
+// http://www.w3.org/TR/DOM-Level-3-XPath/xpath.html#XPathEvaluator
+
 [
     TypeChecking=Interface,
 ] partial interface Document {
-    // DOM Level 3 XPath (XPathEvaluator interface)
     [MeasureAs=DocumentXPathCreateExpression, RaisesException] XPathExpression createExpression(DOMString expression, optional XPathNSResolver? resolver = null);
 
     [MeasureAs=DocumentXPathCreateNSResolver] XPathNSResolver createNSResolver(Node nodeResolver);
 
     [MeasureAs=DocumentXPathEvaluate, RaisesException] XPathResult evaluate(DOMString expression, Node contextNode, optional XPathNSResolver? resolver = null, optional unsigned short type = 0, optional object? inResult = null);
 };