li>Otherwise, return null.</li>
          </ol>
        </li>
        <li>If |attributedScriptOrModule| is null, return <code>undefined</code>.</li>
        <li>Let |attributedScript : Script| be the [= script =] obtained from |attributedScriptOrModule|.[[\HostDefined]].</li>
        <li>
          If |attributedScript| is a [= classic script =] and its <dfn data-cite="HTML5#muted-errors">muted errors</dfn> boolean is equal to <code>true</code>, return <code>undefined</code>.
          <p class="ednote">
  