de class="idl"><a class="idl-code" data-link-type="exception" href="https://webidl.spec.whatwg.org/#syntaxerror" id="ref-for-syntaxerror">SyntaxError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException">DOMException</a></code>.</p>
    <li>
     <p>Invoke <a href="https://heycam.github.io/webidl/#es-add-delete">the
 default <code>add</code> operation</a>, which the
 <code>setlike&lt;DOMString></code> would have if <code c