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diff --git a/Source/WebCore/rendering/RenderAttachment.h b/Source/WebCore/rendering/RenderAttachment.h
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+++ b/Source/WebCore/rendering/RenderAttachment.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. AND ITS CONTRIBUTORS ``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 ITS 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
+
+#if ENABLE(ATTACHMENT_ELEMENT)
+
+#include "HTMLAttachmentElement.h"
+#include "RenderReplaced.h"
+
+namespace WebCore {
+
+class RenderAttachment final : public RenderReplaced {
+public:
+    RenderAttachment(HTMLAttachmentElement&, RenderStyle&&);
+
+    HTMLAttachmentElement& attachmentElement() const;
+
+    void invalidate();
+
+private:
+    void element() const = delete;
+    bool isAttachment() const override { return true; }
+    const char* renderName() const override { return "RenderAttachment"; }
+
+    bool shouldDrawSelectionTint() const override { return false; }
+
+    void layout() override;
+
+    int baselinePosition(FontBaseline, bool, LineDirectionMode, LinePositionMode) const override;
+
+    LayoutUnit m_minimumIntrinsicWidth;
+};
+
+inline RenderAttachment* HTMLAttachmentElement::renderer() const
+{
+    return downcast<RenderAttachment>(HTMLElement::renderer());
+}
+
+} // namespace WebCore
+
+SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderAttachment, isAttachment())
+
+#endif // ENABLE(ATTACHMENT_ELEMENT)