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drm-retrieve-persistent-license.html 
<!doctype html>
<html>
  <head>
    <meta charset=utf-8>
    <title>Encrypted Media Extensions: persistent-license, retrieve and playback, DRM</title>
    <link rel="help" href="https://w3c.github.io/encrypted-media/">

    <!-- Helper scripts for Encrypted Media Extensions tests  -->
    <script src=/encrypted-media/util/utils.js></script>
    <script src=/encrypted-media/util/fetch.js></script>
    <script src=/encrypted-media/util/utf8.js></script>
    <script src=/encrypted-media/util/testmediasource.js></script>
  </head>
  <body>
    <div id='log'></div>

    <div id='video'>
      <video id="videoelement" width="200px"></video>
    </div>

    <script>
    // Wait for a message from the main window with details of our task
    window.addEventListener( 'message', function( event ) {

        var config = event.data.config,
            configuration = {   initDataTypes: [ config.initDataType ],
                                audioCapabilities: [ { contentType: config.audioType } ],
                                videoCapabilities: [ { contentType: config.videoType } ],
                                sessionTypes: [ 'persistent-license' ] },
            assertions = [ ];

        var _mediaKeySession;
        config.video = document.getElementById('videoelement');

        function onComplete() {
            window.opener.postMessage({ testResult: assertions }, '*');
        }

        function onFailure(error) {
            assertions.push( { actual: false, expected: true, message: error.toString() } );
            onComplete();
        }

        function onTimeupdate(event) {
            if ( config.video.currentTime > ( config.duration || 1 ) ) {
                config.video.removeEventListener('timeupdate', onTimeupdate);
                config.video.pause();

                _mediaKeySession.closed
                    .then(onComplete)
                    .catch(onFailure);
                _mediaKeySession.close()
                    .catch(onFailure);
            }
        }

        navigator.requestMediaKeySystemAccess(config.keysystem, [ configuration ] )
        .then(function(access) {
            return access.createMediaKeys();
        }).then(function(mediaKeys) {
            return config.video.setMediaKeys(mediaKeys);
        }).then(function() {
            config.video.addEventListener('timeupdate', onTimeupdate);
            _mediaKeySession = config.video.mediaKeys.createSession( 'persistent-license' );
            return _mediaKeySession.load(event.data.sessionId);
        }).then(function( success ) {
            if ( !success ) throw new DOMException( 'Could not load session' );
            return testmediasource(config);
        }).then(function(source) {
            config.video.src = URL.createObjectURL(source);
            config.video.play();
        })
        .catch(onFailure);
    } );

    </script>
  </body>
</html>
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