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diff --git a/dom/webidl/MessageEvent.webidl b/dom/webidl/MessageEvent.webidl
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+++ b/dom/webidl/MessageEvent.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://html.spec.whatwg.org/#messageevent
+ */
+
+[Exposed=(Window,Worker)]
+interface MessageEvent : Event {
+  constructor(DOMString type, optional MessageEventInit eventInitDict = {});
+
+  /**
+   * Custom data associated with this event.
+   */
+  [GetterThrows]
+  readonly attribute any data;
+
+  /**
+   * The origin of the site from which this event originated, which is the
+   * scheme, ":", and if the URI has a host, "//" followed by the
+   * host, and if the port is not the default for the given scheme,
+   * ":" followed by that port.  This value does not have a trailing slash.
+   */
+  readonly attribute USVString origin;
+
+  /**
+   * The last event ID string of the event source, for server-sent DOM events; this
+   * value is the empty string for cross-origin messaging.
+   */
+  readonly attribute DOMString lastEventId;
+
+  /**
+   * The window or port which originated this event.
+   */
+  readonly attribute MessageEventSource? source;
+
+  [Pure, Cached, Frozen]
+  readonly attribute sequence<MessagePort> ports;
+
+  /**
+   * Initializes this event with the given data, in a manner analogous to
+   * the similarly-named method on the Event interface, also setting the
+   * data, origin, source, and lastEventId attributes of this appropriately.
+   */
+  undefined initMessageEvent(DOMString type,
+                             optional boolean bubbles = false,
+                             optional boolean cancelable = false,
+                             optional any data = null,
+                             optional DOMString origin = "",
+                             optional DOMString lastEventId = "",
+                             optional MessageEventSource? source = null,
+                             optional sequence<MessagePort> ports = []);
+};
+
+dictionary MessageEventInit : EventInit {
+  any data = null;
+  DOMString origin = "";
+  DOMString lastEventId = "";
+  MessageEventSource? source = null;
+  sequence<MessagePort> ports = [];
+};
+
+typedef (WindowProxy or MessagePort or ServiceWorker) MessageEventSource;