1 files changed, 12 insertions, 0 deletions
diff --git a/dom/webidl/BeforeUnloadEvent.webidl b/dom/webidl/BeforeUnloadEvent.webidl
new file mode 100644
index 0000000000..e64e1b2c29
--- /dev/null
+++ b/dom/webidl/BeforeUnloadEvent.webidl
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ *
+ * For more information on this interface, please see
+ * http://www.whatwg.org/specs/web-apps/current-work/#beforeunloadevent
+ */
+
+interface BeforeUnloadEvent : Event {
+  attribute DOMString returnValue;
+};