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diff --git a/Source/WebCore/html/HTMLAttachmentElement.cpp b/Source/WebCore/html/HTMLAttachmentElement.cpp
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+++ b/Source/WebCore/html/HTMLAttachmentElement.cpp
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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.
+ */
+
+#include "config.h"
+#include "HTMLAttachmentElement.h"
+
+#if ENABLE(ATTACHMENT_ELEMENT)
+
+#include "File.h"
+#include "HTMLNames.h"
+#include "RenderAttachment.h"
+
+namespace WebCore {
+
+using namespace HTMLNames;
+
+HTMLAttachmentElement::HTMLAttachmentElement(const QualifiedName& tagName, Document& document)
+    : HTMLElement(tagName, document)
+{
+    ASSERT(hasTagName(attachmentTag));
+}
+
+HTMLAttachmentElement::~HTMLAttachmentElement()
+{
+}
+
+Ref<HTMLAttachmentElement> HTMLAttachmentElement::create(const QualifiedName& tagName, Document& document)
+{
+    return adoptRef(*new HTMLAttachmentElement(tagName, document));
+}
+
+RenderPtr<RenderElement> HTMLAttachmentElement::createElementRenderer(RenderStyle&& style, const RenderTreePosition&)
+{
+    return createRenderer<RenderAttachment>(*this, WTFMove(style));
+}
+
+File* HTMLAttachmentElement::file() const
+{
+    return m_file.get();
+}
+
+void HTMLAttachmentElement::setFile(File* file)
+{
+    m_file = file;
+
+    if (auto* renderer = this->renderer())
+        renderer->invalidate();
+}
+
+void HTMLAttachmentElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
+{
+    if (name == progressAttr || name == subtitleAttr || name == titleAttr || name == typeAttr) {
+        if (auto* renderer = this->renderer())
+            renderer->invalidate();
+    }
+
+    HTMLElement::parseAttribute(name, value);
+}
+
+String HTMLAttachmentElement::attachmentTitle() const
+{
+    auto& title = attributeWithoutSynchronization(titleAttr);
+    if (!title.isEmpty())
+        return title;
+    return m_file ? m_file->name() : String();
+}
+
+String HTMLAttachmentElement::attachmentType() const
+{
+    return attributeWithoutSynchronization(typeAttr);
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(ATTACHMENT_ELEMENT)