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diff --git a/dom/svg/DOMSVGAnimatedNumberList.h b/dom/svg/DOMSVGAnimatedNumberList.h
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+++ b/dom/svg/DOMSVGAnimatedNumberList.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_DOMSVGANIMATEDNUMBERLIST_H_
+#define DOM_SVG_DOMSVGANIMATEDNUMBERLIST_H_
+
+#include "nsCycleCollectionParticipant.h"
+#include "SVGElement.h"
+#include "nsWrapperCache.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/RefPtr.h"
+
+namespace mozilla {
+
+class SVGAnimatedNumberList;
+class SVGNumberList;
+
+namespace dom {
+
+class DOMSVGNumberList;
+
+/**
+ * Class DOMSVGAnimatedNumberList
+ *
+ * This class is used to create the DOM tearoff objects that wrap internal
+ * SVGAnimatedNumberList objects.
+ *
+ * See the architecture comment in DOMSVGAnimatedLengthList.h (that's
+ * LENGTH list). The comment for that class largly applies to this one too
+ * and will go a long way to helping you understand the architecture here.
+ *
+ * This class is strongly intertwined with DOMSVGNumberList and DOMSVGNumber.
+ * Our DOMSVGNumberList base and anim vals are friends and take care of nulling
+ * out our pointers to them when they die (making our pointers to them true
+ * weak refs).
+ */
+class DOMSVGAnimatedNumberList final : public nsWrapperCache {
+  friend class DOMSVGNumberList;
+
+ public:
+  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(DOMSVGAnimatedNumberList)
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(DOMSVGAnimatedNumberList)
+
+  /**
+   * Factory method to create and return a DOMSVGAnimatedNumberList wrapper
+   * for a given internal SVGAnimatedNumberList object. The factory takes care
+   * of caching the object that it returns so that the same object can be
+   * returned for the given SVGAnimatedNumberList each time it is requested.
+   * The cached object is only removed from the cache when it is destroyed due
+   * to there being no more references to it or to any of its descendant
+   * objects. If that happens, any subsequent call requesting the DOM wrapper
+   * for the SVGAnimatedNumberList will naturally result in a new
+   * DOMSVGAnimatedNumberList being returned.
+   */
+  static already_AddRefed<DOMSVGAnimatedNumberList> GetDOMWrapper(
+      SVGAnimatedNumberList* aList, dom::SVGElement* aElement,
+      uint8_t aAttrEnum);
+
+  /**
+   * This method returns the DOMSVGAnimatedNumberList wrapper for an internal
+   * SVGAnimatedNumberList object if it currently has a wrapper. If it does
+   * not, then nullptr is returned.
+   */
+  static DOMSVGAnimatedNumberList* GetDOMWrapperIfExists(
+      SVGAnimatedNumberList* aList);
+
+  /**
+   * Called by internal code to notify us when we need to sync the length of
+   * our baseVal DOM list with its internal list. This is called just prior to
+   * the length of the internal baseVal list being changed so that any DOM list
+   * items that need to be removed from the DOM list can first get their values
+   * from their internal counterpart.
+   *
+   * The only time this method could fail is on OOM when trying to increase the
+   * length of the DOM list. If that happens then this method simply clears the
+   * list and returns. Callers just proceed as normal, and we simply accept
+   * that the DOM list will be empty (until successfully set to a new value).
+   */
+  void InternalBaseValListWillChangeTo(const SVGNumberList& aNewValue);
+  void InternalAnimValListWillChangeTo(const SVGNumberList& aNewValue);
+
+  /**
+   * Returns true if our attribute is animating (in which case our animVal is
+   * not simply a mirror of our baseVal).
+   */
+  bool IsAnimating() const;
+
+  // WebIDL
+  dom::SVGElement* GetParentObject() const { return mElement; }
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+  // These aren't weak refs because mBaseVal and mAnimVal are weak
+  already_AddRefed<DOMSVGNumberList> BaseVal();
+  already_AddRefed<DOMSVGNumberList> AnimVal();
+
+ private:
+  /**
+   * Only our static GetDOMWrapper() factory method may create objects of our
+   * type.
+   */
+  DOMSVGAnimatedNumberList(dom::SVGElement* aElement, uint8_t aAttrEnum)
+      : mBaseVal(nullptr),
+        mAnimVal(nullptr),
+        mElement(aElement),
+        mAttrEnum(aAttrEnum) {}
+
+  ~DOMSVGAnimatedNumberList();
+
+  /// Get a reference to this DOM wrapper object's internal counterpart.
+  SVGAnimatedNumberList& InternalAList();
+  const SVGAnimatedNumberList& InternalAList() const;
+
+  // Weak refs to our DOMSVGNumberList baseVal/animVal objects. These objects
+  // are friends and take care of clearing these pointers when they die, making
+  // these true weak references.
+  DOMSVGNumberList* mBaseVal;
+  DOMSVGNumberList* mAnimVal;
+
+  // Strong ref to our element to keep it alive. We hold this not only for
+  // ourself, but also for our base/animVal and all of their items.
+  RefPtr<dom::SVGElement> mElement;
+
+  uint8_t mAttrEnum;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // DOM_SVG_DOMSVGANIMATEDNUMBERLIST_H_