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diff --git a/dom/smil/SMILInterval.h b/dom/smil/SMILInterval.h
new file mode 100644
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+++ b/dom/smil/SMILInterval.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_SMILINTERVAL_H_
+#define DOM_SMIL_SMILINTERVAL_H_
+
+#include "mozilla/SMILInstanceTime.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+
+//----------------------------------------------------------------------
+// SMILInterval class
+//
+// A structure consisting of a begin and end time. The begin time must be
+// resolved (i.e. not indefinite or unresolved).
+//
+// For an overview of how this class is related to other SMIL time classes see
+// the documentation in SMILTimeValue.h
+
+class SMILInterval {
+ public:
+  SMILInterval();
+  SMILInterval(const SMILInterval& aOther);
+  ~SMILInterval();
+  void Unlink(bool aFiltered = false);
+
+  const SMILInstanceTime* Begin() const {
+    MOZ_ASSERT(mBegin && mEnd,
+               "Requesting Begin() on un-initialized instance time");
+    return mBegin;
+  }
+  SMILInstanceTime* Begin();
+
+  const SMILInstanceTime* End() const {
+    MOZ_ASSERT(mBegin && mEnd,
+               "Requesting End() on un-initialized instance time");
+    return mEnd;
+  }
+  SMILInstanceTime* End();
+
+  void SetBegin(SMILInstanceTime& aBegin);
+  void SetEnd(SMILInstanceTime& aEnd);
+  void Set(SMILInstanceTime& aBegin, SMILInstanceTime& aEnd) {
+    SetBegin(aBegin);
+    SetEnd(aEnd);
+  }
+
+  void FixBegin();
+  void FixEnd();
+
+  using InstanceTimeList = nsTArray<RefPtr<SMILInstanceTime>>;
+
+  void AddDependentTime(SMILInstanceTime& aTime);
+  void RemoveDependentTime(const SMILInstanceTime& aTime);
+  void GetDependentTimes(InstanceTimeList& aTimes);
+
+  // Cue for assessing if this interval can be filtered
+  bool IsDependencyChainLink() const;
+
+ private:
+  RefPtr<SMILInstanceTime> mBegin;
+  RefPtr<SMILInstanceTime> mEnd;
+
+  // SMILInstanceTimes to notify when this interval is changed or deleted.
+  InstanceTimeList mDependentTimes;
+
+  // Indicates if the end points of the interval are fixed or not.
+  //
+  // Note that this is not the same as having an end point whose TIME is fixed
+  // (i.e. SMILInstanceTime::IsFixed() returns true). This is because it is
+  // possible to have an end point with a fixed TIME and yet still update the
+  // end point to refer to a different SMILInstanceTime object.
+  //
+  // However, if mBegin/EndFixed is true, then BOTH the SMILInstanceTime
+  // OBJECT returned for that end point and its TIME value will not change.
+  bool mBeginFixed;
+  bool mEndFixed;
+};
+
+}  // namespace mozilla
+
+#endif  // DOM_SMIL_SMILINTERVAL_H_