The Tor Browser / file revision

 /* -*- 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/. */

 // http://dev.w3.org/csswg/cssom/#the-medialist-interface

 [ArrayClass]

 interface MediaList {

   [TreatNullAs=EmptyString]

            attribute DOMString        mediaText;

   readonly attribute unsigned long    length;

   getter DOMString?  item(unsigned long index);

   [Throws]

   void               deleteMedium(DOMString oldMedium);

   [Throws]

   void               appendMedium(DOMString newMedium);

 };