diff -r 000000000000 -r 6474c204b198 layout/mathml/nsMathMLmunderoverFrame.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/mathml/nsMathMLmunderoverFrame.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsMathMLmunderoverFrame_h___
+#define nsMathMLmunderoverFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsMathMLContainerFrame.h"
+
+//
+// <munderover> -- attach an underscript-overscript pair to a base
+//
+
+class nsMathMLmunderoverFrame : public nsMathMLContainerFrame {
+public:
+  NS_DECL_FRAMEARENA_HELPERS
+
+  friend nsIFrame* NS_NewMathMLmunderoverFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
+
+  virtual nsresult
+  Place(nsRenderingContext& aRenderingContext,
+        bool                 aPlaceOrigin,
+        nsHTMLReflowMetrics& aDesiredSize) MOZ_OVERRIDE;
+
+  NS_IMETHOD
+  InheritAutomaticData(nsIFrame* aParent) MOZ_OVERRIDE;
+
+  NS_IMETHOD
+  TransmitAutomaticData() MOZ_OVERRIDE;
+
+  NS_IMETHOD
+  UpdatePresentationData(uint32_t        aFlagsValues,
+                         uint32_t        aFlagsToUpdate) MOZ_OVERRIDE;
+
+  virtual nsresult
+  AttributeChanged(int32_t         aNameSpaceID,
+                   nsIAtom*        aAttribute,
+                   int32_t         aModType) MOZ_OVERRIDE;
+
+  uint8_t
+  ScriptIncrement(nsIFrame* aFrame) MOZ_OVERRIDE;
+
+protected:
+  nsMathMLmunderoverFrame(nsStyleContext* aContext) : nsMathMLContainerFrame(aContext),
+                                                      mIncrementUnder(false),
+                                                      mIncrementOver(false) {}
+  virtual ~nsMathMLmunderoverFrame();
+
+private:
+  bool mIncrementUnder;
+  bool mIncrementOver;
+};
+
+
+#endif /* nsMathMLmunderoverFrame_h___ */