anchor.diff:  <input name="predicted"       type="hidden" value="none">
   <input name="revert_if_wrong" type="hidden" value="off">
   
  -<div id="predict-checkbox-cell">
  +<div id="predict-checkbox-cell" style="display:none;">
     <div id="predict-checkbox-title">predict</div>
     <input type="checkbox" id="predict-checkbox"/>
   </div>
  
positive.code:     // called from
      // 1) edit.html.erb when page refreshes
      // 2) run_tests.js.erb when test has run
  
      // TODO: $predictCell.hide(); if turned off at server
  
      if (settings.predict() === 'on') {
        predictOn(); // enables auto-revert after first test
      } else {
  
negative.code:     }
    };
  
    if (cd.env['PREDICT'] !== 'off') {
      $predictCheckboxCell.show();
      $revertTitle.show();
      $buttonsCell.show();
    }
  
  });
  </script>
  