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diff --git a/dom/svg/SVGViewportElement.h b/dom/svg/SVGViewportElement.h
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+++ b/dom/svg/SVGViewportElement.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/. */
+
+#ifndef DOM_SVG_SVGVIEWPORTELEMENT_H_
+#define DOM_SVG_SVGVIEWPORTELEMENT_H_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/SVGImageContext.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/dom/FromParser.h"
+#include "nsIContentInlines.h"
+#include "SVGAnimatedEnumeration.h"
+#include "SVGAnimatedLength.h"
+#include "SVGAnimatedPreserveAspectRatio.h"
+#include "SVGAnimatedViewBox.h"
+#include "SVGGraphicsElement.h"
+#include "SVGPoint.h"
+#include "SVGPreserveAspectRatio.h"
+
+namespace mozilla {
+class AutoPreserveAspectRatioOverride;
+class SVGOuterSVGFrame;
+class SVGViewportFrame;
+
+namespace dom {
+class DOMSVGAnimatedPreserveAspectRatio;
+class SVGAnimatedRect;
+class SVGViewElement;
+class SVGViewportElement;
+
+class svgFloatSize {
+ public:
+  svgFloatSize(float aWidth, float aHeight) : width(aWidth), height(aHeight) {}
+  bool operator!=(const svgFloatSize& rhs) {
+    return width != rhs.width || height != rhs.height;
+  }
+  float width;
+  float height;
+};
+
+class SVGViewportElement : public SVGGraphicsElement {
+  friend class mozilla::SVGOuterSVGFrame;
+  friend class mozilla::SVGViewportFrame;
+
+ protected:
+  explicit SVGViewportElement(
+      already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
+  ~SVGViewportElement() = default;
+
+ public:
+  bool IsNodeOfType(uint32_t aFlags) const override;
+
+  // nsIContent interface
+  NS_IMETHOD_(bool) IsAttributeMapped(const nsAtom* aAttribute) const override;
+
+  // SVGElement specializations:
+  virtual gfxMatrix PrependLocalTransformsTo(
+      const gfxMatrix& aMatrix,
+      SVGTransformTypes aWhich = eAllTransforms) const override;
+
+  virtual bool HasValidDimensions() const override;
+
+  // SVGViewportElement methods:
+
+  float GetLength(uint8_t aCtxType);
+
+  // public helpers:
+
+  /**
+   * Returns true if this element has a base/anim value for its "viewBox"
+   * attribute that defines a viewBox rectangle with finite values, or
+   * if there is a view element overriding this element's viewBox and it
+   * has a valid viewBox.
+   *
+   * Note that this does not check whether we need to synthesize a viewBox,
+   * so you must call ShouldSynthesizeViewBox() if you need to chck that too.
+   *
+   * Note also that this method does not pay attention to whether the width or
+   * height values of the viewBox rect are positive!
+   */
+  bool HasViewBox() const { return GetViewBoxInternal().HasRect(); }
+
+  /**
+   * Returns true if we should synthesize a viewBox for ourselves (that is, if
+   * we're the root element in an image document, and we're not currently being
+   * painted for an <svg:image> element).
+   *
+   * Only call this method if HasViewBox() returns false.
+   */
+  bool ShouldSynthesizeViewBox() const;
+
+  bool HasViewBoxOrSyntheticViewBox() const {
+    return HasViewBox() || ShouldSynthesizeViewBox();
+  }
+
+  bool HasChildrenOnlyTransform() const { return mHasChildrenOnlyTransform; }
+
+  void UpdateHasChildrenOnlyTransform();
+
+  enum ChildrenOnlyTransformChangedFlags { eDuringReflow = 1 };
+
+  /**
+   * This method notifies the style system that the overflow rects of our
+   * immediate childrens' frames need to be updated. It is called by our own
+   * frame when changes (e.g. to currentScale) cause our children-only
+   * transform to change.
+   *
+   * The reason we have this method instead of overriding
+   * GetAttributeChangeHint is because we need to act on non-attribute (e.g.
+   * currentScale) changes in addition to attribute (e.g. viewBox) changes.
+   */
+  void ChildrenOnlyTransformChanged(uint32_t aFlags = 0);
+
+  gfx::Matrix GetViewBoxTransform() const;
+
+  svgFloatSize GetViewportSize() const {
+    return svgFloatSize(mViewportWidth, mViewportHeight);
+  }
+
+  void SetViewportSize(const svgFloatSize& aSize) {
+    mViewportWidth = aSize.width;
+    mViewportHeight = aSize.height;
+  }
+
+  /**
+   * Returns true if either this is an SVG <svg> element that is the child of
+   * another non-foreignObject SVG element, or this is a SVG <symbol> element
+   * that is the root of a use-element shadow tree.
+   */
+  bool IsInner() const {
+    const nsIContent* parent = GetFlattenedTreeParent();
+    return parent && parent->IsSVGElement() &&
+           !parent->IsSVGElement(nsGkAtoms::foreignObject);
+  }
+
+  // WebIDL
+  already_AddRefed<SVGAnimatedRect> ViewBox();
+  already_AddRefed<DOMSVGAnimatedPreserveAspectRatio> PreserveAspectRatio();
+  virtual SVGAnimatedViewBox* GetAnimatedViewBox() override;
+
+ protected:
+  // implementation helpers:
+
+  bool IsRootSVGSVGElement() const {
+    NS_ASSERTION((IsInUncomposedDoc() && !GetParent()) ==
+                     (OwnerDoc()->GetRootElement() == this),
+                 "Can't determine if we're root");
+    return !GetParent() && IsInUncomposedDoc() && IsSVGElement(nsGkAtoms::svg);
+  }
+
+  /**
+   * Returns the explicit or default preserveAspectRatio, unless we're
+   * synthesizing a viewBox, in which case it returns the "none" value.
+   */
+  virtual SVGPreserveAspectRatio GetPreserveAspectRatioWithOverride() const {
+    return mPreserveAspectRatio.GetAnimValue();
+  }
+
+  /**
+   * Returns the explicit viewBox rect, if specified, or else a synthesized
+   * viewBox, if appropriate, or else a viewBox matching the dimensions of the
+   * SVG viewport.
+   */
+  SVGViewBox GetViewBoxWithSynthesis(float aViewportWidth,
+                                     float aViewportHeight) const;
+
+  enum { ATTR_X, ATTR_Y, ATTR_WIDTH, ATTR_HEIGHT };
+  SVGAnimatedLength mLengthAttributes[4];
+  static LengthInfo sLengthInfo[4];
+  virtual LengthAttributesInfo GetLengthInfo() override;
+
+  virtual SVGAnimatedPreserveAspectRatio* GetAnimatedPreserveAspectRatio()
+      override;
+
+  virtual const SVGAnimatedViewBox& GetViewBoxInternal() const {
+    return mViewBox;
+  }
+  virtual SVGAnimatedTransformList* GetTransformInternal() const {
+    return mTransforms.get();
+  }
+  SVGAnimatedViewBox mViewBox;
+  SVGAnimatedPreserveAspectRatio mPreserveAspectRatio;
+
+  // The size of the rectangular SVG viewport into which we render. This is
+  // not (necessarily) the same as the content area. See:
+  //
+  //   http://www.w3.org/TR/SVG11/coords.html#ViewportSpace
+  //
+  // XXXjwatt Currently only used for outer <svg>, but maybe we could use -1 to
+  // flag this as an inner <svg> to save the overhead of GetCtx calls?
+  // XXXjwatt our frame should probably reset these when it's destroyed.
+  float mViewportWidth, mViewportHeight;
+
+  bool mHasChildrenOnlyTransform;
+};
+
+}  // namespace dom
+
+}  // namespace mozilla
+
+#endif  // DOM_SVG_SVGVIEWPORTELEMENT_H_