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diff --git a/Source/WebCore/mathml/MathMLOperatorElement.h b/Source/WebCore/mathml/MathMLOperatorElement.h
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+++ b/Source/WebCore/mathml/MathMLOperatorElement.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 "MathMLTokenElement.h"
+
+namespace WebCore {
+
+class MathMLOperatorElement final : public MathMLTokenElement {
+public:
+    static Ref<MathMLOperatorElement> create(const QualifiedName& tagName, Document&);
+    struct OperatorChar {
+        UChar32 character { 0 };
+        bool isVertical { true };
+    };
+    static OperatorChar parseOperatorChar(const String&);
+    const OperatorChar& operatorChar();
+    void setOperatorFormDirty() { m_dictionaryProperty = std::nullopt; }
+    MathMLOperatorDictionary::Form form() { return dictionaryProperty().form; }
+    bool hasProperty(MathMLOperatorDictionary::Flag);
+    Length defaultLeadingSpace();
+    Length defaultTrailingSpace();
+    const Length& leadingSpace();
+    const Length& trailingSpace();
+    const Length& minSize();
+    const Length& maxSize();
+
+private:
+    MathMLOperatorElement(const QualifiedName& tagName, Document&);
+    RenderPtr<RenderElement> createElementRenderer(RenderStyle&&, const RenderTreePosition&) final;
+    void childrenChanged(const ChildChange&) final;
+    void parseAttribute(const QualifiedName&, const AtomicString&) final;
+
+    std::optional<OperatorChar> m_operatorChar;
+
+    std::optional<MathMLOperatorDictionary::Property> m_dictionaryProperty;
+    MathMLOperatorDictionary::Property computeDictionaryProperty();
+    const MathMLOperatorDictionary::Property& dictionaryProperty();
+
+    struct OperatorProperties {
+        unsigned short flags;
+        unsigned short dirtyFlags { MathMLOperatorDictionary::allFlags };
+    };
+    OperatorProperties m_properties;
+    void computeOperatorFlag(MathMLOperatorDictionary::Flag);
+
+    std::optional<Length> m_leadingSpace;
+    std::optional<Length> m_trailingSpace;
+    std::optional<Length> m_minSize;
+    std::optional<Length> m_maxSize;
+};
+
+}
+
+#endif // ENABLE(MATHML)