diff -r 000000000000 -r 6474c204b198 layout/mathml/nsMathMLmactionFrame.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/mathml/nsMathMLmactionFrame.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,72 @@
+/* -*- 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 nsMathMLmactionFrame_h___
+#define nsMathMLmactionFrame_h___
+
+#include "nsCOMPtr.h"
+#include "nsMathMLSelectedFrame.h"
+#include "nsIDOMEventListener.h"
+#include "mozilla/Attributes.h"
+
+//
+// <maction> -- bind actions to a subexpression
+//
+
+class nsMathMLmactionFrame : public nsMathMLSelectedFrame {
+public:
+  NS_DECL_FRAMEARENA_HELPERS
+
+  friend nsIFrame* NS_NewMathMLmactionFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
+
+  virtual void
+  Init(nsIContent*      aContent,
+       nsIFrame*        aParent,
+       nsIFrame*        aPrevInFlow) MOZ_OVERRIDE;
+
+  virtual nsresult
+  SetInitialChildList(ChildListID     aListID,
+                      nsFrameList&    aChildList) MOZ_OVERRIDE;
+
+  virtual nsresult
+  ChildListChanged(int32_t aModType) MOZ_OVERRIDE;
+
+  virtual nsresult
+  AttributeChanged(int32_t  aNameSpaceID,
+                   nsIAtom* aAttribute,
+                   int32_t  aModType) MOZ_OVERRIDE;
+
+private:
+  void MouseClick();
+  void MouseOver();
+  void MouseOut();
+
+  class MouseListener MOZ_FINAL : public nsIDOMEventListener
+  {
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIDOMEVENTLISTENER
+
+    MouseListener(nsMathMLmactionFrame* aOwner) : mOwner(aOwner) { }
+
+    nsMathMLmactionFrame* mOwner;
+  };
+
+protected:
+  nsMathMLmactionFrame(nsStyleContext* aContext) :
+    nsMathMLSelectedFrame(aContext) {}
+  virtual ~nsMathMLmactionFrame();
+  
+private:
+  int32_t         mActionType;
+  int32_t         mChildCount;
+  int32_t         mSelection;
+  nsRefPtr<MouseListener> mListener;
+
+  // helper to return the frame for the attribute selection="number"
+  nsIFrame* 
+  GetSelectedFrame() MOZ_OVERRIDE;
+};
+
+#endif /* nsMathMLmactionFrame_h___ */