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diff --git a/dom/svg/SVGRect.h b/dom/svg/SVGRect.h
new file mode 100644
index 0000000000..3650c641d0
--- /dev/null
+++ b/dom/svg/SVGRect.h
@@ -0,0 +1,89 @@
+/* -*- 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_SVGRECT_H_
+#define DOM_SVG_SVGRECT_H_
+
+#include "mozilla/dom/SVGElement.h"
+#include "mozilla/gfx/Rect.h"
+
+////////////////////////////////////////////////////////////////////////
+// SVGRect class
+
+namespace mozilla {
+namespace dom {
+
+class SVGSVGElement;
+
+class SVGRect final : public nsWrapperCache {
+ public:
+  enum class RectType : uint8_t { BaseValue, AnimValue, CreatedValue };
+
+  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(SVGRect)
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(SVGRect)
+
+  /**
+   * Generic ctor for objects that are created for an attribute.
+   */
+  SVGRect(SVGAnimatedViewBox* aVal, SVGElement* aSVGElement, RectType aType)
+      : mVal(aVal), mParent(aSVGElement), mType(aType) {
+    MOZ_ASSERT(mParent);
+    MOZ_ASSERT(mType == RectType::BaseValue || mType == RectType::AnimValue);
+  }
+
+  /**
+   * Ctor for creating the objects returned by SVGSVGElement.createSVGRect(),
+   * which do not initially belong to an attribute.
+   */
+  explicit SVGRect(SVGSVGElement* aSVGElement);
+
+  /**
+   * Ctor for all other non-attribute usage i.e getBBox, getExtentOfChar etc.
+   */
+  SVGRect(nsIContent* aParent, const gfx::Rect& aRect)
+      : mVal(nullptr),
+        mRect(aRect),
+        mParent(aParent),
+        mType(RectType::CreatedValue) {
+    MOZ_ASSERT(mParent);
+  }
+
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  float X();
+  float Y();
+  float Width();
+  float Height();
+
+  void SetX(float aX, mozilla::ErrorResult& aRv);
+  void SetY(float aY, mozilla::ErrorResult& aRv);
+  void SetWidth(float aWidth, mozilla::ErrorResult& aRv);
+  void SetHeight(float aHeight, mozilla::ErrorResult& aRv);
+
+  nsIContent* GetParentObject() const {
+    MOZ_ASSERT(mParent);
+    return mParent;
+  }
+
+ private:
+  virtual ~SVGRect();
+
+  // If we're actually representing a viewBox rect then our value
+  // will come from that element's viewBox attribute's value.
+  SVGAnimatedViewBox* mVal;  // kept alive because it belongs to content
+  gfx::Rect mRect;
+
+  // If mType is AnimValue or BaseValue this will be an element that
+  // has a viewBox, otherwise it could be any nsIContent.
+  RefPtr<nsIContent> mParent;
+  const RectType mType;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // DOM_SVG_SVGRECT_H_