diff -r 000000000000 -r 6474c204b198 layout/mathml/nsMathMLmspaceFrame.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/mathml/nsMathMLmspaceFrame.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,56 @@
+/* -*- 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 nsMathMLmspaceFrame_h___
+#define nsMathMLmspaceFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsMathMLContainerFrame.h"
+
+//
+// <mspace> -- space
+//
+
+class nsMathMLmspaceFrame : public nsMathMLContainerFrame {
+public:
+  NS_DECL_FRAMEARENA_HELPERS
+
+  friend nsIFrame* NS_NewMathMLmspaceFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
+
+  NS_IMETHOD
+  TransmitAutomaticData() MOZ_OVERRIDE {
+    // The REC defines the following elements to be space-like:
+    // * an mtext, mspace, maligngroup, or malignmark element;
+    mPresentationData.flags |= NS_MATHML_SPACE_LIKE;
+    return NS_OK;
+  }
+
+  virtual bool IsLeaf() const MOZ_OVERRIDE;
+
+  virtual nsresult
+  Reflow(nsPresContext*          aPresContext,
+         nsHTMLReflowMetrics&     aDesiredSize,
+         const nsHTMLReflowState& aReflowState,
+         nsReflowStatus&          aStatus) MOZ_OVERRIDE;
+  
+protected:
+  nsMathMLmspaceFrame(nsStyleContext* aContext) : nsMathMLContainerFrame(aContext) {}
+  virtual ~nsMathMLmspaceFrame();
+
+  virtual nsresult
+  MeasureForWidth(nsRenderingContext& aRenderingContext,
+                  nsHTMLReflowMetrics& aDesiredSize) MOZ_OVERRIDE;
+
+private:
+  nscoord mWidth;
+  nscoord mHeight;
+  nscoord mDepth;
+
+  // helper method to initialize our member data
+  void 
+  ProcessAttributes(nsPresContext* aPresContext);
+};
+
+#endif /* nsMathMLmspaceFrame_h___ */