diff -r 000000000000 -r 6474c204b198 layout/mathml/nsMathMLmsqrtFrame.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/mathml/nsMathMLmsqrtFrame.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,66 @@
+/* -*- 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/. */
+
+#include "nsMathMLmsqrtFrame.h"
+#include "mozilla/gfx/2D.h"
+
+//
+// <msqrt> -- form a radical - implementation
+//
+
+//NOTE:
+//  The code assumes that TeX fonts are picked.
+//  There is no fall-back to draw the branches of the sqrt explicitly
+//  in the case where TeX fonts are not there. In general, there are no
+//  fall-back(s) in MathML when some (freely-downloadable) fonts are missing.
+//  Otherwise, this will add much work and unnecessary complexity to the core
+//  MathML  engine. Assuming that authors have the free fonts is part of the
+//  deal. We are not responsible for cases of misconfigurations out there.
+
+nsIFrame*
+NS_NewMathMLmsqrtFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
+{
+  return new (aPresShell) nsMathMLmsqrtFrame(aContext);
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmsqrtFrame)
+
+nsMathMLmsqrtFrame::nsMathMLmsqrtFrame(nsStyleContext* aContext) :
+  nsMathMLmencloseFrame(aContext)
+{
+}
+
+nsMathMLmsqrtFrame::~nsMathMLmsqrtFrame()
+{
+}
+
+void
+nsMathMLmsqrtFrame::Init(nsIContent*      aContent,
+                         nsIFrame*        aParent,
+                         nsIFrame*        aPrevInFlow)
+{
+  nsMathMLContainerFrame::Init(aContent, aParent, aPrevInFlow);
+  AllocateMathMLChar(NOTATION_RADICAL);
+  mNotationsToDraw |= NOTATION_RADICAL;
+}
+
+NS_IMETHODIMP
+nsMathMLmsqrtFrame::InheritAutomaticData(nsIFrame* aParent)
+{
+  nsMathMLContainerFrame::InheritAutomaticData(aParent);
+
+  mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;
+
+  return NS_OK;
+}
+
+nsresult
+nsMathMLmsqrtFrame::AttributeChanged(int32_t         aNameSpaceID,
+                                     nsIAtom*        aAttribute,
+                                     int32_t         aModType)
+{
+  return nsMathMLContainerFrame::
+    AttributeChanged(aNameSpaceID, aAttribute, aModType);
+}