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diff --git a/dom/smil/SMILTimeValueSpecParams.h b/dom/smil/SMILTimeValueSpecParams.h
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+++ b/dom/smil/SMILTimeValueSpecParams.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_SMILTIMEVALUESPECPARAMS_H_
+#define DOM_SMIL_SMILTIMEVALUESPECPARAMS_H_
+
+#include "mozilla/SMILTimeValue.h"
+#include "nsAtom.h"
+
+namespace mozilla {
+
+//----------------------------------------------------------------------
+// SMILTimeValueSpecParams
+//
+// A simple data type for storing the result of parsing a single begin or end
+// value (e.g. the '5s' in begin="5s; indefinite; a.begin+2s").
+
+class SMILTimeValueSpecParams {
+ public:
+  SMILTimeValueSpecParams()
+      : mType(INDEFINITE), mSyncBegin(false), mRepeatIteration(0) {}
+
+  // The type of value this specification describes
+  enum { OFFSET, SYNCBASE, EVENT, REPEAT, WALLCLOCK, INDEFINITE } mType;
+
+  // A clock value that is added to:
+  // - type OFFSET: the document begin
+  // - type SYNCBASE: the timebase's begin or end time
+  // - type EVENT: the event time
+  // - type REPEAT: the repeat time
+  // It is not used for WALLCLOCK or INDEFINITE times
+  SMILTimeValue mOffset;
+
+  // The base element that this specification refers to.
+  // For SYNCBASE types, this is the timebase
+  // For EVENT and REPEAT types, this is the eventbase
+  RefPtr<nsAtom> mDependentElemID;
+
+  // The event to respond to.
+  // Only used for EVENT types.
+  RefPtr<nsAtom> mEventSymbol;
+
+  // Indicates if this specification refers to the begin or end of the dependent
+  // element.
+  // Only used for SYNCBASE types.
+  bool mSyncBegin;
+
+  // The repeat iteration to respond to.
+  // Only used for mType=REPEAT.
+  uint32_t mRepeatIteration;
+};
+
+}  // namespace mozilla
+
+#endif  // DOM_SMIL_SMILTIMEVALUESPECPARAMS_H_