         })();
        </script>
        <script type="text/partytown">
          (function () {
            const elm = document.getElementById('testWindowIndex');
            const value = window[0];
            elm.textContent = String(value);
          })();
        </script>
      </li>

      <li>
        <strong>opener</strong>
        <code>
          <span id="testOpener"></span>
        </code>
        <script type="text/partytown">
          (async function () {
            const elm = document.g