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diff --git a/dom/smil/SMILSetAnimationFunction.h b/dom/smil/SMILSetAnimationFunction.h
new file mode 100644
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+++ b/dom/smil/SMILSetAnimationFunction.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_SMIL_SMILSETANIMATIONFUNCTION_H_
+#define DOM_SMIL_SMILSETANIMATIONFUNCTION_H_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/SMILAnimationFunction.h"
+
+namespace mozilla {
+
+//----------------------------------------------------------------------
+// SMILSetAnimationFunction
+//
+// Subclass of SMILAnimationFunction that limits the behaviour to that offered
+// by a <set> element.
+//
+class SMILSetAnimationFunction : public SMILAnimationFunction {
+ public:
+  /*
+   * Sets animation-specific attributes (or marks them dirty, in the case
+   * of from/to/by/values).
+   *
+   * @param aAttribute The attribute being set
+   * @param aValue     The updated value of the attribute.
+   * @param aResult    The nsAttrValue object that may be used for storing the
+   *                   parsed result.
+   * @param aParseResult  Outparam used for reporting parse errors. Will be set
+   *                      to NS_OK if everything succeeds.
+   * @returns true if aAttribute is a recognized animation-related
+   *          attribute; false otherwise.
+   */
+  bool SetAttr(nsAtom* aAttribute, const nsAString& aValue,
+               nsAttrValue& aResult, nsresult* aParseResult = nullptr) override;
+
+  /*
+   * Unsets the given attribute.
+   *
+   * @returns true if aAttribute is a recognized animation-related
+   *          attribute; false otherwise.
+   */
+  bool UnsetAttr(nsAtom* aAttribute) override;
+
+ protected:
+  // Although <set> animation might look like to-animation, unlike to-animation,
+  // it never interpolates values.
+  // Returning false here will mean this animation function gets treated as
+  // a single-valued function and no interpolation will be attempted.
+  bool IsToAnimation() const override { return false; }
+
+  // <set> applies the exact same value across the simple duration.
+  bool IsValueFixedForSimpleDuration() const override { return true; }
+  bool HasAttr(nsAtom* aAttName) const override;
+  const nsAttrValue* GetAttr(nsAtom* aAttName) const override;
+  bool GetAttr(nsAtom* aAttName, nsAString& aResult) const override;
+  bool WillReplace() const override;
+
+  bool IsDisallowedAttribute(const nsAtom* aAttribute) const;
+};
+
+}  // namespace mozilla
+
+#endif  // DOM_SMIL_SMILSETANIMATIONFUNCTION_H_