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diff --git a/dom/smil/SMILCSSProperty.h b/dom/smil/SMILCSSProperty.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/. */
+
+/* representation of a SMIL-animatable CSS property on an element */
+
+#ifndef DOM_SMIL_SMILCSSPROPERTY_H_
+#define DOM_SMIL_SMILCSSPROPERTY_H_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/SMILAttr.h"
+#include "nsAtom.h"
+#include "nsCSSPropertyID.h"
+#include "nsCSSValue.h"
+
+namespace mozilla {
+class ComputedStyle;
+namespace dom {
+class Element;
+}  // namespace dom
+
+/**
+ * SMILCSSProperty: Implements the SMILAttr interface for SMIL animations
+ * that target CSS properties.  Represents a particular animation-targeted CSS
+ * property on a particular element.
+ */
+class SMILCSSProperty : public SMILAttr {
+ public:
+  /**
+   * Constructs a new SMILCSSProperty.
+   * @param  aPropID   The CSS property we're interested in animating.
+   * @param  aElement  The element whose CSS property is being animated.
+   * @param  aBaseComputedStyle  The ComputedStyle to use when getting the base
+   *                             value. If this is nullptr and GetBaseValue is
+   *                             called, an empty SMILValue initialized with
+   *                             the SMILCSSValueType will be returned.
+   */
+  SMILCSSProperty(nsCSSPropertyID aPropID, dom::Element* aElement,
+                  const ComputedStyle* aBaseComputedStyle);
+
+  // SMILAttr methods
+  nsresult ValueFromString(const nsAString& aStr,
+                           const dom::SVGAnimationElement* aSrcElement,
+                           SMILValue& aValue,
+                           bool& aPreventCachingOfSandwich) const override;
+  SMILValue GetBaseValue() const override;
+  nsresult SetAnimValue(const SMILValue& aValue) override;
+  void ClearAnimValue() override;
+
+  /**
+   * Utility method - returns true if the given property is supported for
+   * SMIL animation.
+   *
+   * @param   aProperty  The property to check for animation support.
+   * @return  true if the given property is supported for SMIL animation, or
+   *          false otherwise
+   */
+  static bool IsPropertyAnimatable(nsCSSPropertyID aPropID);
+
+ protected:
+  nsCSSPropertyID mPropID;
+  // Using non-refcounted pointer for mElement -- we know mElement will stay
+  // alive for my lifetime because a SMILAttr (like me) only lives as long
+  // as the Compositing step, and DOM elements don't get a chance to die during
+  // that time.
+  dom::Element* mElement;
+
+  // The style to use when fetching base styles.
+  //
+  // As with mElement, since a SMILAttr only lives as long as the
+  // compositing step and since ComposeAttribute holds an owning reference to
+  // the base ComputedStyle, we can use a non-owning reference here.
+  const ComputedStyle* mBaseComputedStyle;
+};
+
+}  // namespace mozilla
+
+#endif  // DOM_SMIL_SMILCSSPROPERTY_H_