Javascript — Check if browser support fullscreen

fullscreen-support.js

function canGoFullscreen() {
  var el = document.body;
  var check = typeof el.requestFullscreen !== 'undefined' || 
              typeof el.mozRequestFullScreen !== 'undefined' || 
              typeof el.webkitRequestFullscreen !== 'undefined' || 
              typeof el.msRequestFullscreen !== 'undefined' || 
              typeof document.exitFullscreen !== 'undefined' || 
              typeof document.mozCancelFullScreen !== 'undefined' || 
              typeof document.webkitExitFullscreen !== 'undefined';

  return check;
};