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diff --git a/dom/webidl/PromiseRejectionEvent.webidl b/dom/webidl/PromiseRejectionEvent.webidl
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+++ b/dom/webidl/PromiseRejectionEvent.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://html.spec.whatwg.org/multipage/webappapis.html#the-promiserejectionevent-interface
+ */
+
+[Exposed=(Window,Worker)]
+interface PromiseRejectionEvent : Event
+{
+  constructor(DOMString type, PromiseRejectionEventInit eventInitDict);
+
+  [BinaryName="rejectedPromise"]
+  readonly attribute Promise<any> promise;
+  readonly attribute any reason;
+};
+
+dictionary PromiseRejectionEventInit : EventInit {
+  required Promise<any> promise;
+           any reason;
+};