diff -r 000000000000 -r 6474c204b198 layout/mathml/nsMathMLmrootFrame.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/mathml/nsMathMLmrootFrame.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,65 @@
+/* -*- 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 nsMathMLmrootFrame_h___
+#define nsMathMLmrootFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsMathMLContainerFrame.h"
+#include "nsMathMLChar.h"
+
+//
+// <msqrt> and <mroot> -- form a radical
+//
+
+class nsMathMLmrootFrame : public nsMathMLContainerFrame {
+public:
+  NS_DECL_FRAMEARENA_HELPERS
+
+  friend nsIFrame* NS_NewMathMLmrootFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
+
+  virtual void
+  SetAdditionalStyleContext(int32_t          aIndex, 
+                            nsStyleContext*  aStyleContext) MOZ_OVERRIDE;
+  virtual nsStyleContext*
+  GetAdditionalStyleContext(int32_t aIndex) const MOZ_OVERRIDE;
+
+  virtual void
+  Init(nsIContent*      aContent,
+       nsIFrame*        aParent,
+       nsIFrame*        aPrevInFlow) MOZ_OVERRIDE;
+
+  NS_IMETHOD
+  TransmitAutomaticData() MOZ_OVERRIDE;
+
+  virtual nsresult
+  Reflow(nsPresContext*          aPresContext,
+         nsHTMLReflowMetrics&     aDesiredSize,
+         const nsHTMLReflowState& aReflowState,
+         nsReflowStatus&          aStatus) MOZ_OVERRIDE;
+
+  virtual void
+  GetIntrinsicWidthMetrics(nsRenderingContext* aRenderingContext,
+                           nsHTMLReflowMetrics& aDesiredSize) MOZ_OVERRIDE;
+
+  virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
+                                const nsRect&           aDirtyRect,
+                                const nsDisplayListSet& aLists) MOZ_OVERRIDE;
+
+  uint8_t
+  ScriptIncrement(nsIFrame* aFrame) MOZ_OVERRIDE
+  {
+    return (aFrame && aFrame == mFrames.LastChild()) ? 2 : 0;
+  }
+
+protected:
+  nsMathMLmrootFrame(nsStyleContext* aContext);
+  virtual ~nsMathMLmrootFrame();
+  
+  nsMathMLChar mSqrChar;
+  nsRect       mBarRect;
+};
+
+#endif /* nsMathMLmrootFrame_h___ */