text: ({
    name: 'event-ratechange',
    description: 'Event "ratechange"',
    spec: 'http://dev.w3.org/html5/spec/the-iframe-element.html#event-media-ratechange',
    reports: {
      firefox: {
        desc: 'Bug 495040 - Implement playbackRate and related bits ',
        link: 'https://bugzilla.mozilla.org/show_bug.cgi?id=495040'
      }
    },
    assert: function(finish) {
      var audio = this.audio;
  
      audio.addEventListener('ratechange', function() {
        finish(true);
      }, false);
  
      audio.playbackRate = 0.5;
    }
  })
  