anchor.diff:      let html = '';
       let wasIndex = 0;
       html += '<table><tr valign="top">';
  -    html += makeTd(makeIndexLeft());
  -    html += makeTd(makeIndexRight());
       $.each(param.events, (_n, event) => {
         const colour = event.colour;
         if (colour !== '') {
  
positive.code:       <div id="download-button-container"></div>
        <div id="diff-filenames"></div>
      </td>
      <td>
        <div id="diff-content"></div>
      </td>
    </tr>
  
negative.code:     });
      html += '</tr></table>';
      return html;
    };
  
    // - - - - - - - - - - - - - - - - - - - - - - - -
  