sclass HTMLForm {
  new L<Row> rows;
  S tableClass;
  
  asclass Row {
    S label; // HTML
    
    abstract O contents(); // HTML
  }
  
  srecord LiteralRow(S contents) extends Row {
    O contents() { ret contents; }
  }
  
  S html() {
    LLS matrix = map(rows, row -> ll(row.label, strOrEmpty(row.contents())));
    ret htableRaw_valignTop(matrix, empty(tableClass) ? litparams(border := 1, cellpadding := 4) : litparams(class := tableClass));
  }
  
  void add(S label, O contents) {
    rows.add(new LiteralRow(label, contents));
  }
}