diff --git a/dom/webidl/DecoderDoctorNotification.webidl b/dom/webidl/DecoderDoctorNotification.webidl
new file mode 100644
index 000000000000..6f7ec2c6ff1d
--- /dev/null
+++ b/dom/webidl/DecoderDoctorNotification.webidl
@@ -0,0 +1,15 @@
+/* -*- 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/.
+ */
+
+enum DecoderDoctorNotificationType {
+  "cannot-play",
+  "can-play-but-some-missing-decoders"
+};
+
+dictionary DecoderDoctorNotification {
+  required DecoderDoctorNotificationType type;
+  DOMString formats;
+};
diff --git a/dom/webidl/moz.build b/dom/webidl/moz.build
index 7c9170fc1661..6507aa4a9d85 100644
--- a/dom/webidl/moz.build
+++ b/dom/webidl/moz.build
@@ -112,6 +112,7 @@ WEBIDL_FILES = [
     'DataStore.webidl',
     'DataStoreImpl.webidl',
     'DataTransfer.webidl',
+    'DecoderDoctorNotification.webidl',
     'DedicatedWorkerGlobalScope.webidl',
     'DelayNode.webidl',
     'DesktopNotification.webidl',