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diff --git a/dom/svg/SVGSVGElement.h b/dom/svg/SVGSVGElement.h
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+++ b/dom/svg/SVGSVGElement.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_SVGSVGELEMENT_H_
+#define DOM_SVG_SVGSVGELEMENT_H_
+
+#include "SVGAnimatedEnumeration.h"
+#include "SVGViewportElement.h"
+
+nsresult NS_NewSVGSVGElement(
+    nsIContent** aResult, already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
+    mozilla::dom::FromParser aFromParser);
+
+// {4b83982c-e5e9-4ca1-abd4-14d27e8b3531}
+#define MOZILLA_SVGSVGELEMENT_IID                    \
+  {                                                  \
+    0x4b83982c, 0xe5e9, 0x4ca1, {                    \
+      0xab, 0xd4, 0x14, 0xd2, 0x7e, 0x8b, 0x35, 0x31 \
+    }                                                \
+  }
+
+namespace mozilla {
+class AutoSVGViewHandler;
+class SMILTimeContainer;
+class SVGFragmentIdentifier;
+class EventChainPreVisitor;
+
+namespace dom {
+struct DOMMatrix2DInit;
+class DOMSVGAngle;
+class DOMSVGLength;
+class DOMSVGNumber;
+class DOMSVGPoint;
+class SVGMatrix;
+class SVGRect;
+class SVGSVGElement;
+
+// Stores svgView arguments of SVG fragment identifiers.
+class SVGView {
+ public:
+  SVGView();
+
+  SVGAnimatedEnumeration mZoomAndPan;
+  SVGAnimatedViewBox mViewBox;
+  SVGAnimatedPreserveAspectRatio mPreserveAspectRatio;
+  UniquePtr<SVGAnimatedTransformList> mTransforms;
+};
+
+using SVGSVGElementBase = SVGViewportElement;
+
+class SVGSVGElement final : public SVGSVGElementBase {
+  friend class mozilla::SVGFragmentIdentifier;
+  friend class mozilla::SVGOuterSVGFrame;
+  friend class mozilla::AutoSVGViewHandler;
+  friend class mozilla::AutoPreserveAspectRatioOverride;
+  friend class mozilla::dom::SVGView;
+
+ protected:
+  SVGSVGElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
+                FromParser aFromParser);
+  JSObject* WrapNode(JSContext* aCx,
+                     JS::Handle<JSObject*> aGivenProto) override;
+
+  friend nsresult(::NS_NewSVGSVGElement(
+      nsIContent** aResult,
+      already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
+      mozilla::dom::FromParser aFromParser));
+
+  ~SVGSVGElement() = default;
+
+ public:
+  NS_IMPL_FROMNODE_WITH_TAG(SVGSVGElement, kNameSpaceID_SVG, svg)
+
+  // interfaces:
+  NS_DECLARE_STATIC_IID_ACCESSOR(MOZILLA_SVGSVGELEMENT_IID)
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(SVGSVGElement, SVGSVGElementBase)
+
+  /*
+   * Send appropriate events and updates if our root translate
+   * has changed.
+   */
+  MOZ_CAN_RUN_SCRIPT
+  void DidChangeTranslate();
+
+  // nsIContent interface
+  void GetEventTargetParent(EventChainPreVisitor& aVisitor) override;
+  bool IsEventAttributeNameInternal(nsAtom* aName) override;
+
+  // nsINode methods:
+  nsresult Clone(dom::NodeInfo*, nsINode** aResult) const override;
+
+  // WebIDL
+  already_AddRefed<DOMSVGAnimatedLength> X();
+  already_AddRefed<DOMSVGAnimatedLength> Y();
+  already_AddRefed<DOMSVGAnimatedLength> Width();
+  already_AddRefed<DOMSVGAnimatedLength> Height();
+  bool UseCurrentView() const;
+  float CurrentScale() const;
+  void SetCurrentScale(float aCurrentScale);
+  already_AddRefed<DOMSVGPoint> CurrentTranslate();
+  uint32_t SuspendRedraw(uint32_t max_wait_milliseconds);
+  void UnsuspendRedraw(uint32_t suspend_handle_id);
+  void UnsuspendRedrawAll();
+  void ForceRedraw();
+  void PauseAnimations();
+  void UnpauseAnimations();
+  bool AnimationsPaused();
+  float GetCurrentTimeAsFloat();
+  void SetCurrentTime(float seconds);
+  void DeselectAll();
+  already_AddRefed<DOMSVGNumber> CreateSVGNumber();
+  already_AddRefed<DOMSVGLength> CreateSVGLength();
+  already_AddRefed<DOMSVGAngle> CreateSVGAngle();
+  already_AddRefed<DOMSVGPoint> CreateSVGPoint();
+  already_AddRefed<SVGMatrix> CreateSVGMatrix();
+  already_AddRefed<SVGRect> CreateSVGRect();
+  already_AddRefed<DOMSVGTransform> CreateSVGTransform();
+  already_AddRefed<DOMSVGTransform> CreateSVGTransformFromMatrix(
+      const DOMMatrix2DInit& matrix, ErrorResult& rv);
+  using nsINode::GetElementById;  // This does what we want
+  uint16_t ZoomAndPan() const;
+  void SetZoomAndPan(uint16_t aZoomAndPan, ErrorResult& rv);
+
+  // SVGElement overrides
+
+  nsresult BindToTree(BindContext&, nsINode& aParent) override;
+  void UnbindFromTree(bool aNullParent) override;
+  SVGAnimatedTransformList* GetAnimatedTransformList(
+      uint32_t aFlags = 0) override;
+
+  // SVGSVGElement methods:
+
+  // Returns true IFF our attributes are currently overridden by a <view>
+  // element and that element's ID matches the passed-in string.
+  bool IsOverriddenBy(const nsAString& aViewID) const {
+    return mCurrentViewID && mCurrentViewID->Equals(aViewID);
+  }
+
+  SMILTimeContainer* GetTimedDocumentRoot();
+
+  // public helpers:
+
+  const SVGPoint& GetCurrentTranslate() const { return mCurrentTranslate; }
+  bool IsScaledOrTranslated() const {
+    return mCurrentTranslate != SVGPoint() || mCurrentScale != 1.0f;
+  }
+
+  LengthPercentage GetIntrinsicWidth();
+  LengthPercentage GetIntrinsicHeight();
+
+  // This services any pending notifications for the transform on on this root
+  // <svg> node needing to be recalculated.  (Only applicable in
+  // SVG-as-an-image documents.)
+  virtual void FlushImageTransformInvalidation();
+
+ private:
+  // SVGViewportElement methods:
+
+  virtual SVGViewElement* GetCurrentViewElement() const;
+  SVGPreserveAspectRatio GetPreserveAspectRatioWithOverride() const override;
+
+  // implementation helpers:
+
+  /*
+   * While binding to the tree we need to determine if we will be the outermost
+   * <svg> element _before_ the children are bound (as they want to know what
+   * timed document root to register with) and therefore _before_ our parent is
+   * set (both actions are performed by Element::BindToTree) so we
+   * can't use GetOwnerSVGElement() as it relies on GetParent(). This code is
+   * basically a simplified version of GetOwnerSVGElement that uses the parent
+   * parameters passed in instead.
+   *
+   * FIXME(bug 1596690): GetOwnerSVGElement() uses the flattened tree parent
+   * rather than the DOM tree parent nowadays.
+   */
+  bool WillBeOutermostSVG(nsINode& aParent) const;
+
+  LengthPercentage GetIntrinsicWidthOrHeight(int aAttr);
+
+  // invalidate viewbox -> viewport xform & inform frames
+  void InvalidateTransformNotifyFrame();
+
+  // Methods for <image> elements to override my "PreserveAspectRatio" value.
+  // These are private so that only our friends
+  // (AutoPreserveAspectRatioOverride in particular) have access.
+  void SetImageOverridePreserveAspectRatio(const SVGPreserveAspectRatio& aPAR);
+  void ClearImageOverridePreserveAspectRatio();
+
+  // Set/Clear properties to hold old version of preserveAspectRatio
+  // when it's being overridden by an <image> element that we are inside of.
+  bool SetPreserveAspectRatioProperty(const SVGPreserveAspectRatio& aPAR);
+  const SVGPreserveAspectRatio* GetPreserveAspectRatioProperty() const;
+  bool ClearPreserveAspectRatioProperty();
+
+  const SVGAnimatedViewBox& GetViewBoxInternal() const override;
+  SVGAnimatedTransformList* GetTransformInternal() const override;
+
+  EnumAttributesInfo GetEnumInfo() override;
+
+  enum { ZOOMANDPAN };
+  SVGAnimatedEnumeration mEnumAttributes[1];
+  static SVGEnumMapping sZoomAndPanMap[];
+  static EnumInfo sEnumInfo[1];
+
+  // The time container for animations within this SVG document fragment. Set
+  // for all outermost <svg> elements (not nested <svg> elements).
+  UniquePtr<SMILTimeContainer> mTimedDocumentRoot;
+
+  SVGPoint mCurrentTranslate;
+  float mCurrentScale;
+
+  // For outermost <svg> elements created from parsing, animation is started by
+  // the onload event in accordance with the SVG spec, but for <svg> elements
+  // created by script or promoted from inner <svg> to outermost <svg> we need
+  // to manually kick off animation when they are bound to the tree.
+  bool mStartAnimationOnBindToTree;
+
+  bool mImageNeedsTransformInvalidation;
+
+  // mCurrentViewID and mSVGView are mutually exclusive; we can have
+  // at most one non-null.
+  UniquePtr<nsString> mCurrentViewID;
+  UniquePtr<SVGView> mSVGView;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(SVGSVGElement, MOZILLA_SVGSVGELEMENT_IID)
+
+}  // namespace dom
+
+class MOZ_RAII AutoSVGTimeSetRestore {
+ public:
+  AutoSVGTimeSetRestore(dom::SVGSVGElement* aRootElem, float aFrameTime)
+      : mRootElem(aRootElem),
+        mOriginalTime(mRootElem->GetCurrentTimeAsFloat()) {
+    mRootElem->SetCurrentTime(
+        aFrameTime);  // Does nothing if there's no change.
+  }
+
+  ~AutoSVGTimeSetRestore() { mRootElem->SetCurrentTime(mOriginalTime); }
+
+ private:
+  const RefPtr<dom::SVGSVGElement> mRootElem;
+  const float mOriginalTime;
+};
+
+class MOZ_RAII AutoPreserveAspectRatioOverride {
+ public:
+  AutoPreserveAspectRatioOverride(const SVGImageContext& aSVGContext,
+                                  dom::SVGSVGElement* aRootElem)
+      : mRootElem(aRootElem), mDidOverride(false) {
+    MOZ_ASSERT(mRootElem, "No SVG/Symbol node to manage?");
+
+    if (aSVGContext.GetPreserveAspectRatio().isSome()) {
+      // Override preserveAspectRatio in our helper document.
+      // XXXdholbert We should technically be overriding the helper doc's clip
+      // and overflow properties here, too. See bug 272288 comment 36.
+      mRootElem->SetImageOverridePreserveAspectRatio(
+          *aSVGContext.GetPreserveAspectRatio());
+      mDidOverride = true;
+    }
+  }
+
+  ~AutoPreserveAspectRatioOverride() {
+    if (mDidOverride) {
+      mRootElem->ClearImageOverridePreserveAspectRatio();
+    }
+  }
+
+ private:
+  const RefPtr<dom::SVGSVGElement> mRootElem;
+  bool mDidOverride;
+};
+
+}  // namespace mozilla
+
+#endif  // DOM_SVG_SVGSVGELEMENT_H_