diff -r 000000000000 -r 6474c204b198 dom/interfaces/events/nsIDOMPageTransitionEvent.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/interfaces/events/nsIDOMPageTransitionEvent.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+/* -*- 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/. */
+
+#include "nsIDOMEvent.idl"
+
+/**
+ * The nsIDOMPageTransitionEvent interface is used for the pageshow and
+ * pagehide events, which are generic events that apply to both page
+ * load/unload and saving/restoring a document from session history.
+ */
+
+[scriptable, builtinclass, uuid(8a69a3d6-c7da-4caa-993c-7f9583d9f896)]
+interface nsIDOMPageTransitionEvent : nsIDOMEvent
+{
+  /**
+   * Set to true if the document has been or will be persisted across
+   * firing of the event.  For example, if a document is being cached in
+   * session history, |persisted| is true for the PageHide event.
+   */
+  readonly attribute boolean persisted;
+
+  /* Initialize a new pageshow or pagehide event. */
+  void initPageTransitionEvent(in DOMString typeArg,
+                               in boolean canBubbleArg,
+                               in boolean canCancelArg,
+                               in boolean persisted);
+};