code: function(suppliedConfig) {
  
      var targetElement = suppliedConfig.el || getConfig().el;
  
      rootTarget = $(targetElement);
  
      if (rootTarget.length === 0) {
        throw triggerError('No target DOM element was found (' + targetElement + ')');
      }
  
      rootTarget.addClass('bookingjs');
      rootTarget.children(':not(script)').remove();
  
    }
docs: Make sure DOM element is ready and clean it