code: private void appendToCssFunction( CssFormatter formatter ) {
          formatter.append( super.toString() ).append( '(' );
          for( int i=0; i<parameters.size(); i++ ) {
              if( i>0){
                  formatter.append( ',' ).space();
              }
              parameters.get(i).appendTo( formatter );
          }
          formatter.append( ')' );
      }
docs: Write the function without change. We does not know it. It can/must be a CSS function.
  @param formatter the formatter