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diff --git a/dom/svg/SVGAnimatedViewBox.h b/dom/svg/SVGAnimatedViewBox.h
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+++ b/dom/svg/SVGAnimatedViewBox.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_SVGANIMATEDVIEWBOX_H_
+#define DOM_SVG_SVGANIMATEDVIEWBOX_H_
+
+#include "nsCycleCollectionParticipant.h"
+#include "nsError.h"
+#include "SVGAttrTearoffTable.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/SMILAttr.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/dom/SVGAnimatedRect.h"
+
+namespace mozilla {
+
+class SMILValue;
+
+namespace dom {
+class SVGRect;
+class SVGAnimationElement;
+class SVGElement;
+}  // namespace dom
+
+struct SVGViewBox {
+  float x, y;
+  float width, height;
+  bool none;
+
+  SVGViewBox() : x(0.0), y(0.0), width(0.0), height(0.0), none(true) {}
+  SVGViewBox(float aX, float aY, float aWidth, float aHeight)
+      : x(aX), y(aY), width(aWidth), height(aHeight), none(false) {}
+  bool operator==(const SVGViewBox& aOther) const;
+
+  static nsresult FromString(const nsAString& aStr, SVGViewBox* aViewBox);
+};
+
+class SVGAnimatedViewBox {
+ public:
+  friend class AutoChangeViewBoxNotifier;
+  using SVGElement = dom::SVGElement;
+
+  void Init();
+
+  /**
+   * Returns true if the corresponding "viewBox" attribute defined a rectangle
+   * with finite values and nonnegative width/height.
+   * Returns false if the viewBox was set to an invalid
+   * string, or if any of the four rect values were too big to store in a
+   * float, or the width/height are negative.
+   */
+  bool HasRect() const;
+
+  /**
+   * Returns true if the corresponding "viewBox" attribute either defined a
+   * rectangle with finite values or the special "none" value.
+   */
+  bool IsExplicitlySet() const {
+    if (mAnimVal || mHasBaseVal) {
+      const SVGViewBox& rect = GetAnimValue();
+      return rect.none || (rect.width >= 0 && rect.height >= 0);
+    }
+    return false;
+  }
+
+  const SVGViewBox& GetBaseValue() const { return mBaseVal; }
+  void SetBaseValue(const SVGViewBox& aRect, SVGElement* aSVGElement);
+  const SVGViewBox& GetAnimValue() const {
+    return mAnimVal ? *mAnimVal : mBaseVal;
+  }
+  void SetAnimValue(const SVGViewBox& aRect, SVGElement* aSVGElement);
+
+  nsresult SetBaseValueString(const nsAString& aValue, SVGElement* aSVGElement,
+                              bool aDoSetAttr);
+  void GetBaseValueString(nsAString& aValue) const;
+
+  already_AddRefed<dom::SVGAnimatedRect> ToSVGAnimatedRect(
+      SVGElement* aSVGElement);
+
+  already_AddRefed<dom::SVGRect> ToDOMBaseVal(SVGElement* aSVGElement);
+
+  already_AddRefed<dom::SVGRect> ToDOMAnimVal(SVGElement* aSVGElement);
+
+  UniquePtr<SMILAttr> ToSMILAttr(SVGElement* aSVGElement);
+
+ private:
+  SVGViewBox mBaseVal;
+  UniquePtr<SVGViewBox> mAnimVal;
+  bool mHasBaseVal;
+
+ public:
+  struct SMILViewBox : public SMILAttr {
+   public:
+    SMILViewBox(SVGAnimatedViewBox* aVal, SVGElement* aSVGElement)
+        : mVal(aVal), mSVGElement(aSVGElement) {}
+
+    // These will stay alive because a SMILAttr only lives as long
+    // as the Compositing step, and DOM elements don't get a chance to
+    // die during that.
+    SVGAnimatedViewBox* mVal;
+    SVGElement* mSVGElement;
+
+    // SMILAttr methods
+    virtual nsresult ValueFromString(
+        const nsAString& aStr, const dom::SVGAnimationElement* aSrcElement,
+        SMILValue& aValue, bool& aPreventCachingOfSandwich) const override;
+    virtual SMILValue GetBaseValue() const override;
+    virtual void ClearAnimValue() override;
+    virtual nsresult SetAnimValue(const SMILValue& aValue) override;
+  };
+
+  static SVGAttrTearoffTable<SVGAnimatedViewBox, dom::SVGAnimatedRect>
+      sSVGAnimatedRectTearoffTable;
+};
+
+}  // namespace mozilla
+
+#endif  // DOM_SVG_SVGANIMATEDVIEWBOX_H_