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diff --git a/layout/xul/nsBoxFrame.h b/layout/xul/nsBoxFrame.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+/**
+
+  Eric D Vaughan
+  nsBoxFrame is a frame that can lay its children out either vertically or
+horizontally. It lays them out according to a min max or preferred size.
+
+**/
+
+#ifndef nsBoxFrame_h___
+#define nsBoxFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsCOMPtr.h"
+#include "nsContainerFrame.h"
+#include "nsBoxLayout.h"
+
+class nsBoxLayoutState;
+
+namespace mozilla {
+class PresShell;
+namespace gfx {
+class DrawTarget;
+}  // namespace gfx
+}  // namespace mozilla
+
+nsIFrame* NS_NewBoxFrame(mozilla::PresShell* aPresShell,
+                         mozilla::ComputedStyle* aStyle, bool aIsRoot,
+                         nsBoxLayout* aLayoutManager);
+nsIFrame* NS_NewBoxFrame(mozilla::PresShell* aPresShell,
+                         mozilla::ComputedStyle* aStyle);
+
+class nsBoxFrame : public nsContainerFrame {
+ protected:
+  typedef mozilla::gfx::DrawTarget DrawTarget;
+
+ public:
+  NS_DECL_FRAMEARENA_HELPERS(nsBoxFrame)
+#ifdef DEBUG
+  NS_DECL_QUERYFRAME
+#endif
+
+  friend nsIFrame* NS_NewBoxFrame(mozilla::PresShell* aPresShell,
+                                  ComputedStyle* aStyle, bool aIsRoot,
+                                  nsBoxLayout* aLayoutManager);
+  friend nsIFrame* NS_NewBoxFrame(mozilla::PresShell* aPresShell,
+                                  ComputedStyle* aStyle);
+
+  // gets the rect inside our border and debug border. If you wish to paint
+  // inside a box call this method to get the rect so you don't draw on the
+  // debug border or outer border.
+
+  virtual void SetXULLayoutManager(nsBoxLayout* aLayout) override {
+    mLayoutManager = aLayout;
+  }
+  virtual nsBoxLayout* GetXULLayoutManager() override { return mLayoutManager; }
+
+  virtual nsSize GetXULPrefSize(nsBoxLayoutState& aBoxLayoutState) override;
+  virtual nsSize GetXULMinSize(nsBoxLayoutState& aBoxLayoutState) override;
+  virtual nsSize GetXULMaxSize(nsBoxLayoutState& aBoxLayoutState) override;
+  virtual nscoord GetXULFlex() override;
+  virtual nscoord GetXULBoxAscent(nsBoxLayoutState& aBoxLayoutState) override;
+  virtual Valignment GetXULVAlign() const override { return mValign; }
+  virtual Halignment GetXULHAlign() const override { return mHalign; }
+  NS_IMETHOD DoXULLayout(nsBoxLayoutState& aBoxLayoutState) override;
+
+  virtual bool XULComputesOwnOverflowArea() override { return false; }
+
+  // ----- child and sibling operations ---
+
+  // ----- public methods -------
+
+  virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
+                    nsIFrame* aPrevInFlow) override;
+
+  virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
+                                    int32_t aModType) override;
+
+  virtual void MarkIntrinsicISizesDirty() override;
+  virtual nscoord GetMinISize(gfxContext* aRenderingContext) override;
+  virtual nscoord GetPrefISize(gfxContext* aRenderingContext) override;
+
+  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
+                      const ReflowInput& aReflowInput,
+                      nsReflowStatus& aStatus) override;
+
+  virtual void SetInitialChildList(ChildListID aListID,
+                                   nsFrameList& aChildList) override;
+  virtual void AppendFrames(ChildListID aListID,
+                            nsFrameList& aFrameList) override;
+  virtual void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
+                            const nsLineList::iterator* aPrevFrameLine,
+                            nsFrameList& aFrameList) override;
+  virtual void RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) override;
+
+  virtual nsContainerFrame* GetContentInsertionFrame() override;
+
+  virtual void DidSetComputedStyle(ComputedStyle* aOldComputedStyle) override;
+
+  virtual bool IsFrameOfType(uint32_t aFlags) const override {
+    // record that children that are ignorable whitespace should be excluded
+    // (When content was loaded via the XUL content sink, it's already
+    // been excluded, but we need this for when the XUL namespace is used
+    // in other MIME types or when the XUL CSS display types are used with
+    // non-XUL elements.)
+
+    // This is bogus, but it's what we've always done.
+    // (Given that we're replaced, we need to say we're a replaced element
+    // that contains a block so ReflowInput doesn't tell us to be
+    // NS_UNCONSTRAINEDSIZE wide.)
+    return nsContainerFrame::IsFrameOfType(
+        aFlags &
+        ~(nsIFrame::eReplaced | nsIFrame::eReplacedContainsBlock | eXULBox));
+  }
+
+#ifdef DEBUG_FRAME_DUMP
+  virtual nsresult GetFrameName(nsAString& aResult) const override;
+#endif
+
+  virtual void DidReflow(nsPresContext* aPresContext,
+                         const ReflowInput* aReflowInput) override;
+
+  virtual bool HonorPrintBackgroundSettings() const override;
+
+  // virtual so nsStackFrame, nsButtonBoxFrame, nsSliderFrame and nsMenuFrame
+  // can override it
+  virtual void BuildDisplayListForChildren(nsDisplayListBuilder* aBuilder,
+                                           const nsDisplayListSet& aLists);
+
+  virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                                const nsDisplayListSet& aLists) override;
+
+  static nsresult LayoutChildAt(nsBoxLayoutState& aState, nsIFrame* aBox,
+                                const nsRect& aRect);
+
+  /**
+   * Utility method to redirect events on descendants to this frame.
+   * Supports 'allowevents' attribute on descendant elements to allow those
+   * elements and their descendants to receive events.
+   */
+  void WrapListsInRedirector(nsDisplayListBuilder* aBuilder,
+                             const nsDisplayListSet& aIn,
+                             const nsDisplayListSet& aOut);
+
+  /**
+   * Return our wrapper block, if any.
+   */
+  void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;
+
+ private:
+  explicit nsBoxFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
+      : nsBoxFrame(aStyle, aPresContext, kClassID, false, nullptr) {}
+
+ protected:
+  nsBoxFrame(ComputedStyle* aStyle, nsPresContext* aPresContext, ClassID aID,
+             bool aIsRoot = false, nsBoxLayout* aLayoutManager = nullptr);
+  virtual ~nsBoxFrame();
+
+  virtual bool GetInitialEqualSize(bool& aEqualSize);
+  virtual void GetInitialOrientation(bool& aIsHorizontal);
+  virtual void GetInitialDirection(bool& aIsNormal);
+  virtual bool GetInitialHAlignment(Halignment& aHalign);
+  virtual bool GetInitialVAlignment(Valignment& aValign);
+  virtual bool GetInitialAutoStretch(bool& aStretch);
+
+  virtual void DestroyFrom(nsIFrame* aDestructRoot,
+                           PostDestroyData& aPostDestroyData) override;
+
+  nsSize mPrefSize;
+  nsSize mMinSize;
+  nsSize mMaxSize;
+  nscoord mFlex;
+  nscoord mAscent;
+
+  nsCOMPtr<nsBoxLayout> mLayoutManager;
+
+  // Get the point associated with this event. Returns true if a single valid
+  // point was found. Otherwise false.
+  bool GetEventPoint(mozilla::WidgetGUIEvent* aEvent, nsPoint& aPoint);
+  // Gets the event coordinates relative to the widget offset associated with
+  // this frame. Return true if a single valid point was found.
+  bool GetEventPoint(mozilla::WidgetGUIEvent* aEvent,
+                     mozilla::LayoutDeviceIntPoint& aPoint);
+
+ protected:
+  void RegUnregAccessKey(bool aDoReg);
+
+ private:
+  void CacheAttributes();
+
+  // instance variables.
+  Halignment mHalign;
+  Valignment mValign;
+
+};  // class nsBoxFrame
+
+#endif