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diff --git a/Source/WebCore/html/HTMLSlotElement.h b/Source/WebCore/html/HTMLSlotElement.h
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+++ b/Source/WebCore/html/HTMLSlotElement.h
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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.
+ */
+
+#pragma once
+
+
+#include "HTMLElement.h"
+
+namespace WebCore {
+
+class HTMLSlotElement final : public HTMLElement {
+public:
+    static Ref<HTMLSlotElement> create(const QualifiedName&, Document&);
+
+    const Vector<Node*>* assignedNodes() const;
+    struct AssignedNodesOptions {
+        bool flatten;
+    };
+    Vector<Node*> assignedNodes(const AssignedNodesOptions&) const;
+
+    void enqueueSlotChangeEvent();
+    void didRemoveFromSignalSlotList() { m_inSignalSlotList = false; }
+
+    void dispatchSlotChangeEvent();
+
+private:
+    HTMLSlotElement(const QualifiedName&, Document&);
+
+    InsertionNotificationRequest insertedInto(ContainerNode&) final;
+    void removedFrom(ContainerNode&) final;
+    void attributeChanged(const QualifiedName&, const AtomicString& oldValue, const AtomicString& newValue, AttributeModificationReason) final;
+
+    bool m_inSignalSlotList { false };
+};
+
+}
+