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diff --git a/dom/svg/SVGAnimatedPointList.h b/dom/svg/SVGAnimatedPointList.h
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+++ b/dom/svg/SVGAnimatedPointList.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_SVGANIMATEDPOINTLIST_H_
+#define DOM_SVG_SVGANIMATEDPOINTLIST_H_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/SMILAttr.h"
+#include "mozilla/UniquePtr.h"
+#include "SVGPointList.h"
+
+namespace mozilla {
+
+class SMILValue;
+
+namespace dom {
+class DOMSVGPoint;
+class DOMSVGPointList;
+class SVGAnimationElement;
+class SVGElement;
+}  // namespace dom
+
+/**
+ * Class SVGAnimatedPointList
+ *
+ * Despite the fact that no SVGAnimatedPointList interface or objects exist
+ * in the SVG specification (unlike e.g. SVGAnimated*Length*List), we
+ * nevertheless have this internal class. (Note that there is an
+ * SVGAnimatedPoints interface, but that's quite different to
+ * SVGAnimatedLengthList since it is inherited by elements, as opposed to
+ * elements having members of that type.) The reason that we have this class is
+ * to provide a single locked down point of entry to the SVGPointList objects,
+ * which helps ensure that the DOM wrappers for SVGPointList objects' are
+ * always kept in sync. This is vitally important (see the comment in
+ * DOMSVGPointList::InternalListWillChangeTo) and frees consumers from having
+ * to know or worry about wrappers (or forget about them!) for the most part.
+ */
+class SVGAnimatedPointList {
+  // friends so that they can get write access to mBaseVal and mAnimVal
+  friend class dom::DOMSVGPoint;
+  friend class dom::DOMSVGPointList;
+
+ public:
+  SVGAnimatedPointList() = default;
+
+  SVGAnimatedPointList& operator=(const SVGAnimatedPointList& aOther) {
+    mBaseVal = aOther.mBaseVal;
+    if (aOther.mAnimVal) {
+      mAnimVal = MakeUnique<SVGPointList>(*aOther.mAnimVal);
+    }
+    return *this;
+  }
+
+  /**
+   * Because it's so important that mBaseVal and its DOMSVGPointList wrapper
+   * (if any) be kept in sync (see the comment in
+   * DOMSVGPointList::InternalListWillChangeTo), this method returns a const
+   * reference. Only our friend classes may get mutable references to mBaseVal.
+   */
+  const SVGPointList& GetBaseValue() const { return mBaseVal; }
+
+  nsresult SetBaseValueString(const nsAString& aValue);
+
+  void ClearBaseValue();
+
+  /**
+   * const! See comment for GetBaseValue!
+   */
+  const SVGPointList& GetAnimValue() const {
+    return mAnimVal ? *mAnimVal : mBaseVal;
+  }
+
+  nsresult SetAnimValue(const SVGPointList& aNewAnimValue,
+                        dom::SVGElement* aElement);
+
+  void ClearAnimValue(dom::SVGElement* aElement);
+
+  /**
+   * Needed for correct DOM wrapper construction since GetAnimValue may
+   * actually return the baseVal!
+   */
+  void* GetBaseValKey() const { return (void*)&mBaseVal; }
+  void* GetAnimValKey() const { return (void*)&mAnimVal; }
+
+  bool IsAnimating() const { return !!mAnimVal; }
+
+  UniquePtr<SMILAttr> ToSMILAttr(dom::SVGElement* aElement);
+
+ 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="">).
+
+  SVGPointList mBaseVal;
+  UniquePtr<SVGPointList> mAnimVal;
+
+  struct SMILAnimatedPointList : public SMILAttr {
+   public:
+    SMILAnimatedPointList(SVGAnimatedPointList* aVal, dom::SVGElement* aElement)
+        : mVal(aVal), mElement(aElement) {}
+
+    // 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.
+    SVGAnimatedPointList* mVal;
+    dom::SVGElement* mElement;
+
+    // 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_SVGANIMATEDPOINTLIST_H_