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diff --git a/Source/WebCore/dom/ParentNode.idl b/Source/WebCore/dom/ParentNode.idl
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+/*
+ * Copyright (C) 2015 Apple Inc. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+// https://dom.spec.whatwg.org/#interface-parentnode
+[
+    NoInterfaceObject,
+] interface ParentNode {
+    readonly attribute HTMLCollection children;
+    readonly attribute Element firstElementChild;
+    readonly attribute Element lastElementChild;
+    readonly attribute unsigned long childElementCount;
+
+    [CEReactions, Unscopable, MayThrowException] void prepend((Node or DOMString)... nodes);
+    [CEReactions, Unscopable, MayThrowException] void append((Node or DOMString)... nodes);
+
+    // [Unscopable] Element? query(DOMString relativeSelectors);
+    // [NewObject, Unscopable] Elements queryAll(DOMString relativeSelectors);
+    [MayThrowException] Element querySelector(DOMString selectors);
+    [MayThrowException, NewObject] NodeList querySelectorAll(DOMString selectors);
+};