[JS] getWindowScrollBarWidth

function getWindowScrollBarWidth() {
  var isWindowHasScrollbar = window.innerWidth > document.documentElement.clientWidth;

  if (isWindowHasScrollbar) {
      var $outer = $('<div>').css({visibility: 'hidden', width: 100, overflow: 'scroll'}).appendTo('body');
      var widthWithScroll = $('<div>').css({width: '100%'}).appendTo($outer).outerWidth();

      $outer.remove();
      return 100 - widthWithScroll;
  } else {
    return 0;
  }
};