;
            elm.textContent = performance.now();
            elm.className = 'testPerformanceNow';
          })();
        </script>
      </li>

      <li>
        <strong>performance.timing.navigationStart</strong>
        <code>
          <span id="testPerformanceTimingNavigationStart"></span>
        </code>
        <script type="text/partytown">
          (function () {
            const iframe1 = document.createElement('iframe');
            document.head.appendChild(iframe1);
            const ifra