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diff --git a/Source/WebCore/rendering/mathml/RenderMathMLFencedOperator.cpp b/Source/WebCore/rendering/mathml/RenderMathMLFencedOperator.cpp
new file mode 100644
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+++ b/Source/WebCore/rendering/mathml/RenderMathMLFencedOperator.cpp
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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.
+ */
+
+#include "config.h"
+#include "RenderMathMLFencedOperator.h"
+
+#if ENABLE(MATHML)
+
+#include "MathMLOperatorDictionary.h"
+#include "MathMLOperatorElement.h"
+
+namespace WebCore {
+
+using namespace MathMLOperatorDictionary;
+
+RenderMathMLFencedOperator::RenderMathMLFencedOperator(Document& document, RenderStyle&& style, const String& operatorString, MathMLOperatorDictionary::Form form, unsigned short flags)
+    : RenderMathMLOperator(document, WTFMove(style))
+    , m_operatorForm(form)
+    , m_operatorFlags(flags)
+{
+    updateOperatorContent(operatorString);
+}
+
+void RenderMathMLFencedOperator::updateOperatorContent(const String& operatorString)
+{
+    m_operatorChar = MathMLOperatorElement::parseOperatorChar(operatorString);
+
+    // We try and read spacing and boolean properties from the operator dictionary.
+    // However we preserve the Fence and Separator properties specified in the constructor.
+    if (auto entry = search(m_operatorChar.character, m_operatorForm, true)) {
+        m_leadingSpaceInMathUnit = entry.value().leadingSpaceInMathUnit;
+        m_trailingSpaceInMathUnit = entry.value().trailingSpaceInMathUnit;
+        m_operatorFlags = (m_operatorFlags & (MathMLOperatorDictionary::Fence | MathMLOperatorDictionary::Separator)) | entry.value().flags;
+    } else {
+        m_operatorFlags &= MathMLOperatorDictionary::Fence | MathMLOperatorDictionary::Separator; // Flags are disabled by default.
+        m_leadingSpaceInMathUnit = 5; // Default spacing is thickmathspace.
+        m_trailingSpaceInMathUnit = 5; // Default spacing is thickmathspace.
+    }
+
+    updateMathOperator();
+}
+
+LayoutUnit RenderMathMLFencedOperator::leadingSpace() const
+{
+    MathMLElement::Length leadingSpace;
+    leadingSpace.type = MathMLElement::LengthType::MathUnit;
+    leadingSpace.value = static_cast<float>(m_leadingSpaceInMathUnit);
+    return toUserUnits(leadingSpace, style(), 0);
+}
+
+LayoutUnit RenderMathMLFencedOperator::trailingSpace() const
+{
+    MathMLElement::Length trailingSpace;
+    trailingSpace.type = MathMLElement::LengthType::MathUnit;
+    trailingSpace.value = static_cast<float>(m_trailingSpaceInMathUnit);
+    return toUserUnits(trailingSpace, style(), 0);
+}
+
+}
+
+#endif