code: function($super, key, value, properties) {
              $super(key, value, properties);
  
              switch(key) {
  
                  case 'chart.showMarkers':
                      this.showMarkers = (value === 'true');
                      this.mapper.mapValue((value === 'true' ? this.markerRadius : 0), ["plotOptions", "line", "marker", "radius"]);
                      break;
                  default:
                      // no-op, ignore unsupported properties
                      break;
  
              }
          }
docs: override