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diff --git a/dom/canvas/test/webgl-conf/checkout/deqp/temp_externs/w3c_elementtraversal.js b/dom/canvas/test/webgl-conf/checkout/deqp/temp_externs/w3c_elementtraversal.js
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+/*
+ * Copyright 2009 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for DOM Element Traversal interface.
+ *  This file depends on w3c_dom1.js.
+ *  The whole file has been fully type annotated.
+ *  Created from:
+ *    http://www.w3.org/TR/ElementTraversal/#ecmascript-bindings
+ *
+ * @externs
+ * @author arv@google.com (Erik Arvidsson)
+ */
+
+/**
+ * @type {Element}
+ * @see https://developer.mozilla.org/En/DOM/Element.firstElementChild
+ */
+Element.prototype.firstElementChild;
+
+/**
+ * @type {Element}
+ * @see https://developer.mozilla.org/En/DOM/Element.lastElementChild
+ */
+Element.prototype.lastElementChild;
+
+/**
+ * @type {Element}
+ * @see https://developer.mozilla.org/En/DOM/Element.previousElementSibling
+ */
+Element.prototype.previousElementSibling;
+
+/**
+ * @type {Element}
+ * @see https://developer.mozilla.org/En/DOM/Element.nextElementSibling
+ */
+Element.prototype.nextElementSibling;
+
+/**
+ * @type {number}
+ * @see https://developer.mozilla.org/En/DOM/Element.childElementCount
+ */
+Element.prototype.childElementCount;