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diff --git a/dom/webidl/DataContainerEvent.webidl b/dom/webidl/DataContainerEvent.webidl
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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/.
+ */
+
+interface nsIVariant;
+
+[ChromeOnly]
+interface DataContainerEvent : Event {
+ /**
+ * Return the data associated with the given key.
+ *
+ * @param key the key
+ * @return the data associated with the key
+ */
+ nsIVariant? getData(DOMString? key);
+
+ /**
+ * Set the data for the given key.
+ *
+ * @param key the data key
+ * @param data the data
+ * @throws NS_ERROR_UNEXPECTED if the method is called during event
+ * dispatch
+ */
+ [Throws]
+ void setData(DOMString? key, any data);
+};
+