media-session.js

    if ('mediaSession' in navigator) {

      navigator.mediaSession.metadata = new MediaMetadata({
        title: 'Big buck bunny',
        artist: 'Sacha Goedegebure',
        album: 'Big buck bunny',
        artwork: [
        { src: 'bbb-splash.png', sizes: '512x512', type: 'image/png' },
        ]
      });

      navigator.mediaSession.setActionHandler('play', function() {
        
      });
      navigator.mediaSession.setActionHandler('pause', function() {});
      navigator.mediaSession.setActionHandler('seekbackward', function() {});
      navigator.mediaSession.setActionHandler('seekforward', function() {});
      navigator.mediaSession.setActionHandler('previoustrack', function() {});
      navigator.mediaSession.setActionHandler('nexttrack', function() {});
    }