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diff --git a/Source/WebCore/mathml/MathMLFractionElement.cpp b/Source/WebCore/mathml/MathMLFractionElement.cpp
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+++ b/Source/WebCore/mathml/MathMLFractionElement.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 "MathMLFractionElement.h"
+
+#if ENABLE(MATHML)
+
+#include "RenderMathMLFraction.h"
+
+namespace WebCore {
+
+using namespace MathMLNames;
+
+inline MathMLFractionElement::MathMLFractionElement(const QualifiedName& tagName, Document& document)
+    : MathMLPresentationElement(tagName, document)
+{
+}
+
+Ref<MathMLFractionElement> MathMLFractionElement::create(const QualifiedName& tagName, Document& document)
+{
+    return adoptRef(*new MathMLFractionElement(tagName, document));
+}
+
+const MathMLElement::Length& MathMLFractionElement::lineThickness()
+{
+    if (m_lineThickness)
+        return m_lineThickness.value();
+
+    // The MathML3 recommendation states that "medium" is the default thickness.
+    // However, it only states that "thin" and "thick" are respectively thiner and thicker.
+    // The MathML in HTML5 implementation note suggests 50% and 200% and these values are also used in Gecko.
+    auto& thickness = attributeWithoutSynchronization(linethicknessAttr);
+    m_lineThickness = Length();
+    if (equalLettersIgnoringASCIICase(thickness, "thin")) {
+        m_lineThickness.value().type = LengthType::UnitLess;
+        m_lineThickness.value().value = .5;
+    } else if (equalLettersIgnoringASCIICase(thickness, "medium")) {
+        m_lineThickness.value().type = LengthType::UnitLess;
+        m_lineThickness.value().value = 1;
+    } else if (equalLettersIgnoringASCIICase(thickness, "thick")) {
+        m_lineThickness.value().type = LengthType::UnitLess;
+        m_lineThickness.value().value = 2;
+    } else
+        m_lineThickness = parseMathMLLength(thickness);
+    return m_lineThickness.value();
+}
+
+MathMLFractionElement::FractionAlignment MathMLFractionElement::cachedFractionAlignment(const QualifiedName& name, std::optional<FractionAlignment>& alignment)
+{
+    if (alignment)
+        return alignment.value();
+
+    auto& value = attributeWithoutSynchronization(name);
+    if (equalLettersIgnoringASCIICase(value, "left"))
+        alignment = FractionAlignmentLeft;
+    else if (equalLettersIgnoringASCIICase(value, "right"))
+        alignment = FractionAlignmentRight;
+    else
+        alignment = FractionAlignmentCenter;
+    return alignment.value();
+}
+
+MathMLFractionElement::FractionAlignment MathMLFractionElement::numeratorAlignment()
+{
+    return cachedFractionAlignment(numalignAttr, m_numeratorAlignment);
+}
+
+MathMLFractionElement::FractionAlignment MathMLFractionElement::denominatorAlignment()
+{
+    return cachedFractionAlignment(denomalignAttr, m_denominatorAlignment);
+}
+
+void MathMLFractionElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
+{
+    if (name == linethicknessAttr)
+        m_lineThickness = std::nullopt;
+    else if (name == numalignAttr)
+        m_numeratorAlignment = std::nullopt;
+    else if (name == denomalignAttr)
+        m_denominatorAlignment = std::nullopt;
+
+    MathMLElement::parseAttribute(name, value);
+}
+
+RenderPtr<RenderElement> MathMLFractionElement::createElementRenderer(RenderStyle&& style, const RenderTreePosition&)
+{
+    ASSERT(hasTagName(MathMLNames::mfracTag));
+    return createRenderer<RenderMathMLFraction>(*this, WTFMove(style));
+}
+
+}
+
+#endif // ENABLE(MATHML)