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diff --git a/dom/html/TimeRanges.h b/dom/html/TimeRanges.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 mozilla_dom_TimeRanges_h_
+#define mozilla_dom_TimeRanges_h_
+
+#include "nsCOMPtr.h"
+#include "nsISupports.h"
+#include "nsTArray.h"
+#include "nsWrapperCache.h"
+#include "TimeUnits.h"
+
+namespace mozilla {
+class ErrorResult;
+
+namespace dom {
+class TimeRanges;
+}  // namespace dom
+
+namespace dom {
+
+// Implements media TimeRanges:
+// http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#timeranges
+class TimeRanges final : public nsISupports, public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(TimeRanges)
+
+  TimeRanges();
+  explicit TimeRanges(nsISupports* aParent);
+  explicit TimeRanges(const media::TimeIntervals& aTimeIntervals);
+  explicit TimeRanges(const media::TimeRanges& aTimeRanges);
+  TimeRanges(nsISupports* aParent, const media::TimeIntervals& aTimeIntervals);
+  TimeRanges(nsISupports* aParent, const media::TimeRanges& aTimeRanges);
+
+  media::TimeIntervals ToTimeIntervals() const;
+
+  void Add(double aStart, double aEnd);
+
+  // Returns the start time of the first range, or -1 if no ranges exist.
+  double GetStartTime();
+
+  // Returns the end time of the last range, or -1 if no ranges exist.
+  double GetEndTime();
+
+  // See http://www.whatwg.org/html/#normalized-timeranges-object
+  void Normalize(double aTolerance = 0.0);
+
+  // Mutate this TimeRange to be the union of this and aOtherRanges.
+  void Union(const TimeRanges* aOtherRanges, double aTolerance);
+
+  // Mutate this TimeRange to be the intersection of this and aOtherRanges.
+  void Intersection(const TimeRanges* aOtherRanges);
+
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  nsISupports* GetParentObject() const;
+
+  uint32_t Length() const { return mRanges.Length(); }
+
+  double Start(uint32_t aIndex, ErrorResult& aRv) const;
+
+  double End(uint32_t aIndex, ErrorResult& aRv) const;
+
+  double Start(uint32_t aIndex) const { return mRanges[aIndex].mStart; }
+
+  double End(uint32_t aIndex) const { return mRanges[aIndex].mEnd; }
+
+  // Shift all values by aOffset seconds.
+  void Shift(double aOffset);
+
+ private:
+  ~TimeRanges();
+
+  // Comparator which orders TimeRanges by start time. Used by Normalize().
+  struct TimeRange {
+    TimeRange(double aStart, double aEnd) : mStart(aStart), mEnd(aEnd) {}
+    double mStart;
+    double mEnd;
+  };
+
+  struct CompareTimeRanges {
+    bool Equals(const TimeRange& aTr1, const TimeRange& aTr2) const {
+      return aTr1.mStart == aTr2.mStart && aTr1.mEnd == aTr2.mEnd;
+    }
+
+    bool LessThan(const TimeRange& aTr1, const TimeRange& aTr2) const {
+      return aTr1.mStart < aTr2.mStart;
+    }
+  };
+
+  AutoTArray<TimeRange, 4> mRanges;
+
+  nsCOMPtr<nsISupports> mParent;
+
+ public:
+  typedef nsTArray<TimeRange>::index_type index_type;
+  static const index_type NoIndex = index_type(-1);
+
+  index_type Find(double aTime, double aTolerance = 0);
+
+  bool Contains(double aStart, double aEnd) {
+    index_type target = Find(aStart);
+    if (target == NoIndex) {
+      return false;
+    }
+
+    return mRanges[target].mEnd >= aEnd;
+  }
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_TimeRanges_h_