Youtube fullscreen

HTML

<iframe id="ytplayer" width="320" height="240" type="text/html" src="https://www.youtube.com/embed/ab0TSkLe-E0?rel=0&amp;controls=0&amp;showinfo=0&autoplay=1&enablejsapi=1" frameborder="0" allowfullscreen></iframe>

JavaScript

var tag = document.createElement('script');

      tag.src = "https://www.youtube.com/iframe_api";
      var firstScriptTag = document.getElementsByTagName('script')[0];
      firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

        var player;

        function onYouTubeIframeAPIReady() {
            player = new YT.Player('ytplayer', {
                events: {
                    'onReady': onPlayerReady
                }
            });
        }

        function onPlayerReady() {
            player.mute();
            player.setPlaybackRate(2);
        }