docs: function tryFullscreen(shell) {
    //Request full screen
    var elem = shell.element
    
    if(shell._wantFullscreen && !shell._fullscreenActive) {
      var fs = elem.requestFullscreen ||
               elem.requestFullScreen ||
               elem.webkitRequestFullscreen ||
               elem.webkitRequestFullScreen ||
               elem.mozRequestFullscreen ||
               elem.mozRequestFullScreen ||
               function() {}
      fs.call(elem)
    }
    if(shell._wantPointerLock && !shell._pointerLockActive) {
      var pl =  elem.requestPointerLock ||
                elem.webkitRequestPointerLock ||
                elem.mozRequestPointerLock ||
                elem.msRequestPointerLock ||
                elem.oRequestPointerLock ||
                function() {}
      pl.call(elem)
    }
  }