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diff --git a/Source/WebCore/rendering/style/StyleSelfAlignmentData.h b/Source/WebCore/rendering/style/StyleSelfAlignmentData.h
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+/*
+ * Copyright (C) 2015 Igalia S.L. 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
+
+#include "RenderStyleConstants.h"
+
+namespace WebCore {
+
+class StyleSelfAlignmentData {
+public:
+    // Style data for Self-Aligment and Default-Alignment properties: align-{self, items}, justify-{self, items}.
+    // [ <self-position> && <overflow-position>? ] | [ legacy && [ left | right | center ] ]
+    StyleSelfAlignmentData(ItemPosition position, OverflowAlignment overflow, ItemPositionType positionType = NonLegacyPosition)
+        : m_position(position)
+        , m_positionType(positionType)
+        , m_overflow(overflow)
+    {
+    }
+
+    void setPosition(ItemPosition position) { m_position = position; }
+    void setPositionType(ItemPositionType positionType) { m_positionType = positionType; }
+    void setOverflow(OverflowAlignment overflow) { m_overflow = overflow; }
+
+    ItemPosition position() const { return static_cast<ItemPosition>(m_position); }
+    ItemPositionType positionType() const { return static_cast<ItemPositionType>(m_positionType); }
+    OverflowAlignment overflow() const { return static_cast<OverflowAlignment>(m_overflow); }
+
+    bool operator==(const StyleSelfAlignmentData& o) const
+    {
+        return m_position == o.m_position && m_positionType == o.m_positionType && m_overflow == o.m_overflow;
+    }
+
+    bool operator!=(const StyleSelfAlignmentData& o) const
+    {
+        return !(*this == o);
+    }
+
+private:
+    unsigned m_position : 4; // ItemPosition
+    unsigned m_positionType: 1; // Whether or not alignment uses the 'legacy' keyword.
+    unsigned m_overflow : 2; // OverflowAlignment
+};
+
+} // namespace WebCore