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diff --git a/dom/webidl/PerformanceNavigationTiming.webidl b/dom/webidl/PerformanceNavigationTiming.webidl
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+++ b/dom/webidl/PerformanceNavigationTiming.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 origin of this IDL file is
+ * https://w3c.github.io/navigation-timing/#sec-PerformanceNavigationTiming
+ *
+ * Copyright © 2016 W3C® (MIT, ERCIM, Keio, Beihang).
+ * W3C liability, trademark and document use rules apply.
+ */
+
+enum NavigationType {
+  "navigate",
+  "reload",
+  "back_forward",
+  "prerender"
+};
+
+[Exposed=Window,
+ Func="mozilla::dom::PerformanceNavigationTiming::Enabled"]
+interface PerformanceNavigationTiming : PerformanceResourceTiming {
+  readonly        attribute DOMHighResTimeStamp unloadEventStart;
+  readonly        attribute DOMHighResTimeStamp unloadEventEnd;
+  readonly        attribute DOMHighResTimeStamp domInteractive;
+  readonly        attribute DOMHighResTimeStamp domContentLoadedEventStart;
+  readonly        attribute DOMHighResTimeStamp domContentLoadedEventEnd;
+  readonly        attribute DOMHighResTimeStamp domComplete;
+  readonly        attribute DOMHighResTimeStamp loadEventStart;
+  readonly        attribute DOMHighResTimeStamp loadEventEnd;
+  readonly        attribute NavigationType      type;
+  readonly        attribute unsigned short      redirectCount;
+
+  [Default] object toJSON();
+};