tyle);
            style.sheet.insertRule(`#testInsertRule { color: blue; }`);
            const elm = document.getElementById('testInsertRule');
            const sheet = style.sheet;
            const cssRules = sheet.cssRules;
            const cssRule = cssRules[0];
            elm.textContent = cssRule.selectorText;
          })();
        </script>
      </li>

      <li>
        <strong>sheet.deleteRule()</strong>
        <code id="testDeleteRule"></code>
        <script type="text/partytown">
      