anchor.diff:  <script type="text/javascript"><!--
   'use strict';
   $(() => {
  -
  -  // - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  -  // This review page is also loaded in kata/edit (the test page)
  -  // The [resume] & [checkout] buttons are only on kata/edit.
  -  // - - - - - - - - - - - - - - - - - - - - - - - - - - - -
   
     const inTestPage = () => {
       return $('#kata-page').length !== 0;
  
positive.code:     });
    };
  
    //-----------------------------------------
    // refresh [fork]
    //-----------------------------------------
  
    const refreshForkButton = () => {
      const button = $('#fork-button');
      cd.setTip(button, () => {
        const tip = `create a new exercise<br/>from this traffic-light's files`;
  
negative.code:   // - - - - - - - - - - - - - - - - - - - - - - - -
  
    setTrafficLightsCssWidth();
    setupButton('fork', () => cd.forkDialog(param.id, param.nowIndex));
    setForkButtonTip();
    if (!inTestPage()) {
      refresh();
    }
  
  });
  
  