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diff --git a/Source/WebCore/rendering/mathml/MathMLStyle.h b/Source/WebCore/rendering/mathml/MathMLStyle.h
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+++ b/Source/WebCore/rendering/mathml/MathMLStyle.h
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+/*
+ * Copyright (C) 2016 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER 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
+
+#if ENABLE(MATHML)
+
+#include "Element.h"
+#include "MathMLElement.h"
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+
+class MathMLStyle: public RefCounted<MathMLStyle> {
+public:
+    MathMLStyle() { }
+    static Ref<MathMLStyle> create();
+
+    bool displayStyle() const { return m_displayStyle; }
+    void setDisplayStyle(bool displayStyle) { m_displayStyle = displayStyle; }
+
+    MathMLElement::MathVariant mathVariant() const { return m_mathVariant; }
+    void setMathVariant(MathMLElement::MathVariant mathvariant) { m_mathVariant = mathvariant; }
+
+    void resolveMathMLStyle(RenderObject*);
+    static void resolveMathMLStyleTree(RenderObject*);
+
+private:
+    bool isDisplayStyleAlwaysFalse(RenderObject*);
+    const MathMLStyle* getMathMLStyle(RenderObject* renderer);
+    RenderObject* getMathMLParentNode(RenderObject*);
+    void updateStyleIfNeeded(RenderObject*, bool, MathMLElement::MathVariant);
+
+    bool m_displayStyle { false };
+    MathMLElement::MathVariant m_mathVariant { MathMLElement::MathVariant::None };
+};
+
+}
+
+#endif // ENABLE(MATHML)