// Getting IFrame element without id

var playerIframe = document.getElementsByTagName("iframe")[0];

​

// Futute player object

var yPlayer;

​

loadYouTubeApi();

​

// This function loads the IFrame Player API code asynchronously.

function loadYouTubeApi() {

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

  tag.src = "https://www.youtube.com/iframe_api";

  var firstScriptTag = document.getElementsByTagName('script')[0];

  firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

}

​

// This function initializes YouTube player

// after the API code downloads.

// Notice. We are passing playerIframe element retrieved above.

function onYouTubeIframeAPIReady() {

  yPlayer = new YT.Player(playerIframe, {

    events: {

      onReady: playVideo

    }

  });

}

​

// This function plays video without sound,

// once the player is ready.

function playVideo() {

  yPlayer.playVideo();

  yPlayer.mute();

}