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diff --git a/dom/webidl/PageTransitionEvent.webidl b/dom/webidl/PageTransitionEvent.webidl
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+++ b/dom/webidl/PageTransitionEvent.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/.
+ */
+
+/**
+ * The PageTransitionEvent 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.
+ */
+
+[Exposed=Window]
+interface PageTransitionEvent : Event
+{
+  constructor(DOMString type,
+              optional PageTransitionEventInit eventInitDict = {});
+
+  /**
+   * 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;
+
+  // Whether the document is in the middle of a frame swap.
+  [ChromeOnly]
+  readonly attribute boolean inFrameSwap;
+};
+
+dictionary PageTransitionEventInit : EventInit
+{
+  boolean persisted = false;
+  boolean inFrameSwap = false;
+};