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diff --git a/layout/mathml/nsMathMLmsqrtFrame.h b/layout/mathml/nsMathMLmsqrtFrame.h
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+++ b/layout/mathml/nsMathMLmsqrtFrame.h
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+/* -*- 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 nsMathMLmsqrtFrame_h___
+#define nsMathMLmsqrtFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsMathMLmencloseFrame.h"
+
+//
+// <msqrt> -- form a radical
+//
+
+/*
+The MathML REC describes:
+
+The <msqrt> element is used to display square roots.
+The syntax for <msqrt> is:
+  <msqrt> base </msqrt>
+
+Attributes of <msqrt> and <mroot>:
+
+None (except the attributes allowed for all MathML elements, listed in Section
+2.3.4). 
+
+The <mroot> element increments scriptlevel by 2, and sets displaystyle to
+"false", within index, but leaves both attributes unchanged within base. The
+<msqrt> element leaves both attributes unchanged within all its arguments.
+These attributes are inherited by every element from its rendering environment,
+but can be set explicitly only on <mstyle>. (See Section 3.3.4.) 
+*/
+
+class nsMathMLmsqrtFrame : public nsMathMLmencloseFrame {
+public:
+  NS_DECL_FRAMEARENA_HELPERS
+
+  friend nsIFrame* NS_NewMathMLmsqrtFrame(nsIPresShell*   aPresShell,
+                                          nsStyleContext* aContext);
+
+  virtual void
+  Init(nsIContent*       aContent,
+       nsContainerFrame* aParent,
+       nsIFrame*         aPrevInFlow) override;
+
+  NS_IMETHOD
+  InheritAutomaticData(nsIFrame* aParent) override;
+
+  virtual nsresult
+  AttributeChanged(int32_t         aNameSpaceID,
+                   nsIAtom*        aAttribute,
+                   int32_t         aModType) override;
+
+  virtual bool
+  IsMrowLike() override
+  {
+    return mFrames.FirstChild() != mFrames.LastChild() ||
+           !mFrames.FirstChild();
+  }
+
+protected:
+  explicit nsMathMLmsqrtFrame(nsStyleContext* aContext);
+  virtual ~nsMathMLmsqrtFrame();
+};
+
+#endif /* nsMathMLmsqrtFrame_h___ */
+