docs: function ($obj, propertyNames) {
        if (agent.jqueryVersion < 1.9) {
          var result = {};
          $.each(propertyNames, function (idx, propertyName) {
            result[propertyName] = $obj.css(propertyName);
          });
          return result;
        }
        return $obj.css.call($obj, propertyNames);
      }