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diff --git a/dom/webidl/ExtendableMessageEvent.webidl b/dom/webidl/ExtendableMessageEvent.webidl
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+++ b/dom/webidl/ExtendableMessageEvent.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/.
+ *
+ * For more information on this interface, please see
+ * https://w3c.github.io/ServiceWorker/#extendablemessage-event-section
+ */
+
+[Exposed=(ServiceWorker)]
+interface ExtendableMessageEvent : ExtendableEvent {
+  constructor(DOMString type,
+              optional ExtendableMessageEventInit eventInitDict = {});
+
+  /**
+   * Custom data associated with this event.
+   */
+  [GetterThrows]
+  readonly attribute any data;
+
+  /**
+   * The origin of the site from which this event originated.
+   */
+  readonly attribute DOMString origin;
+
+  /**
+   * The last event ID string of the event source.
+   */
+  readonly attribute DOMString lastEventId;
+
+  /**
+   * The client, service worker or port which originated this event.
+   */
+  readonly attribute (Client or ServiceWorker or MessagePort)? source;
+
+  [Constant, Cached, Frozen]
+  readonly attribute sequence<MessagePort> ports;
+};
+
+dictionary ExtendableMessageEventInit : ExtendableEventInit {
+  any data = null;
+  DOMString origin = "";
+  DOMString lastEventId = "";
+  (Client or ServiceWorker or MessagePort)? source = null;
+  sequence<MessagePort> ports = [];
+};