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diff --git a/Source/WebCore/mathml/MathMLRowElement.cpp b/Source/WebCore/mathml/MathMLRowElement.cpp
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+++ b/Source/WebCore/mathml/MathMLRowElement.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 "MathMLRowElement.h"
+
+#if ENABLE(MATHML)
+
+#include "MathMLNames.h"
+#include "MathMLOperatorElement.h"
+#include "RenderMathMLFenced.h"
+#include "RenderMathMLMenclose.h"
+#include "RenderMathMLRoot.h"
+#include "RenderMathMLRow.h"
+
+namespace WebCore {
+
+using namespace MathMLNames;
+
+MathMLRowElement::MathMLRowElement(const QualifiedName& tagName, Document& document)
+    : MathMLPresentationElement(tagName, document)
+{
+}
+
+Ref<MathMLRowElement> MathMLRowElement::create(const QualifiedName& tagName, Document& document)
+{
+    return adoptRef(*new MathMLRowElement(tagName, document));
+}
+
+void MathMLRowElement::childrenChanged(const ChildChange& change)
+{
+    for (auto child = firstChild(); child; child = child->nextSibling()) {
+        if (child->hasTagName(moTag))
+            static_cast<MathMLOperatorElement*>(child)->setOperatorFormDirty();
+    }
+
+    MathMLPresentationElement::childrenChanged(change);
+}
+
+RenderPtr<RenderElement> MathMLRowElement::createElementRenderer(RenderStyle&& style, const RenderTreePosition&)
+{
+    if (hasTagName(msqrtTag) || hasTagName(mrootTag))
+        return createRenderer<RenderMathMLRoot>(*this, WTFMove(style));
+
+    if (hasTagName(mfencedTag))
+        return createRenderer<RenderMathMLFenced>(*this, WTFMove(style));
+
+    ASSERT(hasTagName(merrorTag) || hasTagName(mphantomTag) || hasTagName(mrowTag) || hasTagName(mstyleTag));
+    return createRenderer<RenderMathMLRow>(*this, WTFMove(style));
+}
+
+bool MathMLRowElement::acceptsDisplayStyleAttribute()
+{
+    return hasTagName(mstyleTag);
+}
+
+bool MathMLRowElement::acceptsMathVariantAttribute()
+{
+    return hasTagName(mstyleTag);
+}
+
+}
+
+#endif // ENABLE(MATHML)