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diff --git a/dom/webidl/XRInputSourceEvent.webidl b/dom/webidl/XRInputSourceEvent.webidl
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index 0000000000..488b1b958d
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+++ b/dom/webidl/XRInputSourceEvent.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://immersive-web.github.io/webxr/#xrinputsourceevent-interface
+ */
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRInputSourceEvent : Event {
+  constructor(DOMString type, XRInputSourceEventInit eventInitDict);
+  [SameObject] readonly attribute XRFrame frame;
+  [SameObject] readonly attribute XRInputSource inputSource;
+};
+
+dictionary XRInputSourceEventInit : EventInit {
+  required XRFrame frame;
+  required XRInputSource inputSource;
+};