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diff --git a/dom/svg/SVGAnimatedNumberList.h b/dom/svg/SVGAnimatedNumberList.h
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+++ b/dom/svg/SVGAnimatedNumberList.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_SVGANIMATEDNUMBERLIST_H_
+#define DOM_SVG_SVGANIMATEDNUMBERLIST_H_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/SMILAttr.h"
+#include "mozilla/UniquePtr.h"
+#include "SVGNumberList.h"
+
+namespace mozilla {
+
+class SMILValue;
+
+namespace dom {
+class SVGAnimationElement;
+class SVGElement;
+}  // namespace dom
+
+/**
+ * Class SVGAnimatedNumberList
+ *
+ * This class is very different to the SVG DOM interface of the same name found
+ * in the SVG specification. This is a lightweight internal class - see
+ * DOMSVGAnimatedNumberList for the heavier DOM class that wraps instances of
+ * this class and implements the SVG specification's SVGAnimatedNumberList DOM
+ * interface.
+ *
+ * Except where noted otherwise, this class' methods take care of keeping the
+ * appropriate DOM wrappers in sync (see the comment in
+ * DOMSVGAnimatedNumberList::InternalBaseValListWillChangeTo) so that their
+ * consumers don't need to concern themselves with that.
+ */
+class SVGAnimatedNumberList {
+  // friends so that they can get write access to mBaseVal
+  friend class dom::DOMSVGNumber;
+  friend class dom::DOMSVGNumberList;
+
+ public:
+  SVGAnimatedNumberList() = default;
+
+  SVGAnimatedNumberList& operator=(const SVGAnimatedNumberList& aOther) {
+    mIsBaseSet = aOther.mIsBaseSet;
+    mBaseVal = aOther.mBaseVal;
+    if (aOther.mAnimVal) {
+      mAnimVal = MakeUnique<SVGNumberList>(*aOther.mAnimVal);
+    }
+    return *this;
+  }
+
+  /**
+   * Because it's so important that mBaseVal and its DOMSVGNumberList wrapper
+   * (if any) be kept in sync (see the comment in
+   * DOMSVGAnimatedNumberList::InternalBaseValListWillChangeTo), this method
+   * returns a const reference. Only our friend classes may get mutable
+   * references to mBaseVal.
+   */
+  const SVGNumberList& GetBaseValue() const { return mBaseVal; }
+
+  nsresult SetBaseValueString(const nsAString& aValue);
+
+  void ClearBaseValue(uint32_t aAttrEnum);
+
+  const SVGNumberList& GetAnimValue() const {
+    return mAnimVal ? *mAnimVal : mBaseVal;
+  }
+
+  nsresult SetAnimValue(const SVGNumberList& aNewAnimValue,
+                        dom::SVGElement* aElement, uint32_t aAttrEnum);
+
+  void ClearAnimValue(dom::SVGElement* aElement, uint32_t aAttrEnum);
+
+  // Returns true if the animated value of this list has been explicitly
+  // set (either by animation, or by taking on the base value which has been
+  // explicitly set by markup or a DOM call), false otherwise.
+  // If this returns false, the animated value is still valid, that is,
+  // usable, and represents the default base value of the attribute.
+  bool IsExplicitlySet() const { return !!mAnimVal || mIsBaseSet; }
+
+  bool IsAnimating() const { return !!mAnimVal; }
+
+  UniquePtr<SMILAttr> ToSMILAttr(dom::SVGElement* aSVGElement,
+                                 uint8_t aAttrEnum);
+
+ private:
+  // mAnimVal is a pointer to allow us to determine if we're being animated or
+  // not. Making it a non-pointer member and using mAnimVal.IsEmpty() to check
+  // if we're animating is not an option, since that would break animation *to*
+  // the empty string (<set to="">).
+
+  SVGNumberList mBaseVal;
+  UniquePtr<SVGNumberList> mAnimVal;
+  bool mIsBaseSet = false;
+
+  struct SMILAnimatedNumberList : public SMILAttr {
+   public:
+    SMILAnimatedNumberList(SVGAnimatedNumberList* aVal,
+                           dom::SVGElement* aSVGElement, uint8_t aAttrEnum)
+        : mVal(aVal), mElement(aSVGElement), mAttrEnum(aAttrEnum) {}
+
+    // 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.
+    SVGAnimatedNumberList* mVal;
+    dom::SVGElement* mElement;
+    uint8_t mAttrEnum;
+
+    // SMILAttr methods
+    nsresult ValueFromString(const nsAString& aStr,
+                             const dom::SVGAnimationElement* aSrcElement,
+                             SMILValue& aValue,
+                             bool& aPreventCachingOfSandwich) const override;
+    SMILValue GetBaseValue() const override;
+    void ClearAnimValue() override;
+    nsresult SetAnimValue(const SMILValue& aValue) override;
+  };
+};
+
+}  // namespace mozilla
+
+#endif  // DOM_SVG_SVGANIMATEDNUMBERLIST_H_