Work with youtube iframe

gistfile1.txt

// iframe
var youtubePlayer = document.getElementsByClassName('youtube-player')[0];

// play
youtubePlayer.contentWindow.postMessage('{"event":"command","func":"playVideo","args":""}', '*');

// pause
youtubePlayer.contentWindow.postMessage('{"event":"command","func":"pauseVideo","args":""}', '*');

// stop
youtubePlayer.contentWindow.postMessage('{"event":"command","func":"stopVideo","args":""}', '*');