         })();
        </script>
      </li>

      <li>
        <strong>btoa</strong>
        <code id="testBtoa"></code>
      </li>

      <li>
        <strong>atob</strong>
        <code id="testAtob"></code>
        <script type="text/partytown">
          (function () {
            const b = document.getElementById('testBtoa');
            const a = document.getElementById('testAtob');
            const v1 = window.btoa('88');
            const v2 = atob(v1);
            b.textContent = v1;
          