anchor.diff:        `${makeRevertCircle(light)}
          ${makePredictCircle(light)}
          <div class="diff-traffic-light"
  -         data-id="${param.id}"
  -         data-avatar-index="${param.avatarIndex}"
  +         data-id="${review.params.id}"
  +         data-avatar-index="${review.params.avatarIndex}"
            data-number="${number}"
            data-colour="${colour}"
            data-index="${light.index}">
  
positive.code: 
    // - - - - - - - - - - - - - - - - - - - - - - - -
    const moveToAvatar = (id) => {
      param.id = id;
      const index = review.inDiffMode() ? 1 : -1;
      review.moveToTrafficLight(index);
    };
  
negative.code: 
    const refreshIndexNavigator = () => {
      refreshIndex($('#first-index'),prevEventIndex(1));
      refreshIndex($('#prev-index'), prevEventIndex(review.params.nowIndex-1));
      $('#review-index-box').html(makeIndexHtml());
      refreshIndex($('#next-index'), nextEventIndex(review.params.nowIndex+1));
      refreshIndex($('#last-index'), nextEventIndex(review.params.events.length-1));
    };
  
    // - - - - - - - - - - - - - - - - - - - - - - - -
  