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diff --git a/dom/smil/nsSMILTimeValueSpecParams.h b/dom/smil/nsSMILTimeValueSpecParams.h
new file mode 100644
index 000000000..7a5ada626
--- /dev/null
+++ b/dom/smil/nsSMILTimeValueSpecParams.h
@@ -0,0 +1,68 @@
+/* -*- 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 NS_SMILTIMEVALUESPECPARAMS_H_
+#define NS_SMILTIMEVALUESPECPARAMS_H_
+
+#include "nsSMILTimeValue.h"
+#include "nsIAtom.h"
+
+//----------------------------------------------------------------------
+// nsSMILTimeValueSpecParams
+//
+// 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 nsSMILTimeValueSpecParams
+{
+public:
+  nsSMILTimeValueSpecParams()
+  :
+    mType(INDEFINITE),
+    mSyncBegin(false),
+    mRepeatIterationOrAccessKey(0)
+  { }
+
+  // The type of value this specification describes
+  enum {
+    OFFSET,
+    SYNCBASE,
+    EVENT,
+    REPEAT,
+    ACCESSKEY,
+    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
+  // - type ACCESSKEY: the keypress time
+  // It is not used for WALLCLOCK or INDEFINITE times
+  nsSMILTimeValue   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<nsIAtom> mDependentElemID;
+
+  // The event to respond to.
+  // Only used for EVENT types.
+  RefPtr<nsIAtom> 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 (type=REPEAT) or access key (type=ACCESSKEY) to
+  // respond to.
+  uint32_t          mRepeatIterationOrAccessKey;
+};
+
+#endif // NS_SMILTIMEVALUESPECPARAMS_H_