anchor.diff:        html.writeln('<th>${data[i][0]}</th>');
         for (int j = 1; j < colNum; j++) {
           String value = data[i][j];
  -        html.writeln('<td class=\"${tdColor(value)}\">$value</td>');
  +        html.writeln('<td class=\"${tdColorClass(value)}\">$value</td>');
         }
         html.writeln('</tr>');
       }
  
positive.code:     return html.toString();
    }
  
    String tdColor(String value) {
      int val = int.parse(value);
      if (val == -1) {
        return 'warning';
  
negative.code:     );
    }
  
    /// Generate the entire HTML report.
    /// TODO(kaiyuanw): Could use local css and js files so that this works
    /// without network connections
    String toHTML() {
      StringBuffer html = new StringBuffer();
      html.writeln(
  