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diff --git a/dom/webidl/MediaSession.webidl b/dom/webidl/MediaSession.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/mediasession/#idl-index
+ */
+
+enum MediaSessionPlaybackState {
+  "none",
+  "paused",
+  "playing"
+};
+
+enum MediaSessionAction {
+  "play",
+  "pause",
+  "seekbackward",
+  "seekforward",
+  "previoustrack",
+  "nexttrack",
+  "skipad",
+  "seekto",
+  "stop",
+};
+
+callback MediaSessionActionHandler = undefined(MediaSessionActionDetails details);
+
+[Exposed=Window, Pref="dom.media.mediasession.enabled"]
+interface MediaSession {
+  attribute MediaMetadata? metadata;
+
+  attribute MediaSessionPlaybackState playbackState;
+
+  undefined setActionHandler(MediaSessionAction action, MediaSessionActionHandler? handler);
+
+  [Throws]
+  undefined setPositionState(optional MediaPositionState state = {});
+
+  // Fire the action handler. It's test-only for now.
+  [ChromeOnly]
+  undefined notifyHandler(MediaSessionActionDetails details);
+};
+
+[Exposed=Window, Pref="dom.media.mediasession.enabled"]
+interface MediaMetadata {
+  [Throws]
+  constructor(optional MediaMetadataInit init = {});
+
+  attribute DOMString title;
+  attribute DOMString artist;
+  attribute DOMString album;
+  // https://github.com/w3c/mediasession/issues/237
+  // Take and return `MediaImage` on setter and getter.
+  [Frozen, Cached, Pure, Throws]
+  attribute sequence<object> artwork;
+};
+
+dictionary MediaMetadataInit {
+  DOMString title = "";
+  DOMString artist = "";
+  DOMString album = "";
+  sequence<MediaImage> artwork = [];
+};
+
+dictionary MediaImage {
+  required USVString src;
+  DOMString sizes = "";
+  DOMString type = "";
+};
+
+// Spec issue https://github.com/w3c/mediasession/issues/254
+dictionary MediaSessionActionDetails {
+  required MediaSessionAction action;
+  double seekOffset;
+  double seekTime;
+  boolean fastSeek;
+};
+
+dictionary MediaPositionState {
+  double duration;
+  double playbackRate;
+  double position;
+};