code: function _removeShowElement() {
      var elms = document.querySelectorAll('.introjs-showElement');
  
      for (var i = 0, l = elms.length; i < l; i++) {
          var elm = elms[i];
          _removeClass(elm, /introjs-[a-zA-Z]+/g);
      }
  }
docs: To remove all show element(s)
  
  @api private
  @method _removeShowElement