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diff --git a/Source/WebCore/rendering/mathml/RenderMathMLFencedOperator.h b/Source/WebCore/rendering/mathml/RenderMathMLFencedOperator.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 "MathMLOperatorDictionary.h"
+#include "MathMLOperatorElement.h"
+#include "RenderMathMLOperator.h"
+
+namespace WebCore {
+
+class RenderMathMLFencedOperator final : public RenderMathMLOperator {
+public:
+    RenderMathMLFencedOperator(Document&, RenderStyle&&, const String& operatorString, MathMLOperatorDictionary::Form, unsigned short flags = 0);
+    void updateOperatorContent(const String&);
+
+private:
+    bool isRenderMathMLFencedOperator() const final { return true; }
+    bool isVertical() const final { return m_operatorChar.isVertical; }
+    UChar32 textContent() const final { return m_operatorChar.character; }
+    LayoutUnit leadingSpace() const final;
+    LayoutUnit trailingSpace() const final;
+
+    // minsize always has the default value "1em".
+    LayoutUnit minSize() const final { return style().fontCascade().size(); }
+
+    // maxsize always has the default value "infinity".
+    LayoutUnit maxSize() const final { return intMaxForLayoutUnit; }
+
+    bool hasOperatorFlag(MathMLOperatorDictionary::Flag flag) const final { return m_operatorFlags & flag; }
+
+    // We always use the MathOperator class for anonymous mfenced operators, since they do not have text content in the DOM.
+    bool useMathOperator() const final { return true; }
+
+    MathMLOperatorElement::OperatorChar m_operatorChar;
+    unsigned short m_leadingSpaceInMathUnit;
+    unsigned short m_trailingSpaceInMathUnit;
+    MathMLOperatorDictionary::Form m_operatorForm;
+    unsigned short m_operatorFlags;
+};
+
+}; // namespace WebCore
+
+SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderMathMLFencedOperator, isRenderMathMLFencedOperator())
+
+#endif // ENABLE(MATHML)