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diff --git a/dom/svg/SVGTransformableElement.h b/dom/svg/SVGTransformableElement.h
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+++ b/dom/svg/SVGTransformableElement.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_SVGTRANSFORMABLEELEMENT_H_
+#define DOM_SVG_SVGTRANSFORMABLEELEMENT_H_
+
+#include "gfxMatrix.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/SVGAnimatedTransformList.h"
+#include "mozilla/dom/SVGElement.h"
+#include "mozilla/gfx/Matrix.h"
+#include "mozilla/UniquePtr.h"
+
+namespace mozilla::dom {
+
+class DOMSVGAnimatedTransformList;
+class SVGGraphicsElement;
+class SVGMatrix;
+class SVGRect;
+struct SVGBoundingBoxOptions;
+
+class SVGTransformableElement : public SVGElement {
+ public:
+  explicit SVGTransformableElement(already_AddRefed<dom::NodeInfo>&& aNodeInfo)
+      : SVGElement(std::move(aNodeInfo)) {}
+  virtual ~SVGTransformableElement() = default;
+
+  nsresult Clone(dom::NodeInfo*, nsINode** aResult) const override = 0;
+
+  // WebIDL
+  already_AddRefed<DOMSVGAnimatedTransformList> Transform();
+
+  // nsIContent interface
+  nsChangeHint GetAttributeChangeHint(const nsAtom* aAttribute,
+                                      int32_t aModType) const override;
+
+  // SVGElement overrides
+  bool IsEventAttributeNameInternal(nsAtom* aName) override;
+
+  gfxMatrix PrependLocalTransformsTo(
+      const gfxMatrix& aMatrix,
+      SVGTransformTypes aWhich = eAllTransforms) const override;
+  const gfx::Matrix* GetAnimateMotionTransform() const override;
+  void SetAnimateMotionTransform(const gfx::Matrix* aMatrix) override;
+
+  SVGAnimatedTransformList* GetAnimatedTransformList(
+      uint32_t aFlags = 0) override;
+  nsStaticAtom* GetTransformListAttrName() const override {
+    return nsGkAtoms::transform;
+  }
+
+  bool IsTransformable() override { return true; }
+
+ protected:
+  /**
+   * Helper for overrides of PrependLocalTransformsTo.  If both arguments are
+   * provided they are multiplied in the order in which the arguments appear,
+   * and the result is returned.  If neither argument is provided, the identity
+   * matrix is returned.  If only one argument is provided its transform is
+   * returned.
+   */
+  static gfxMatrix GetUserToParentTransform(
+      const gfx::Matrix* aAnimateMotionTransform,
+      const SVGAnimatedTransformList* aTransforms);
+
+  UniquePtr<SVGAnimatedTransformList> mTransforms;
+
+  // XXX maybe move this to property table, to save space on un-animated elems?
+  UniquePtr<gfx::Matrix> mAnimateMotionTransform;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // DOM_SVG_SVGTRANSFORMABLEELEMENT_H_