Sandbox

Item	Done	Time
Example task 1
Example task 2
Example task 3

<script> (function () {

 'use strict';

 function formatTime(d) {
   return d.toLocaleTimeString('en-US', {
     hour: 'numeric',
     minute: '2-digit',
     second: '2-digit'
   });
 }

 function findTsBox(cb) {
   var tr = cb.closest('tr');
   return tr ? tr.querySelector('.mw-ts-box') : null;
 }

 document.addEventListener('change', function (ev) {
   var cb = ev.target;
   if (cb.matches && cb.matches('.mw-checkbox-ts')) {
     var tsBox = findTsBox(cb);
     if (tsBox) tsBox.textContent = cb.checked ? formatTime(new Date()) : ;
   }
 }, false);

})(); </script>