e" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a> <a href="#dom-customstateset-add-value-value"><code><c- g>value</c-></code></a>);
};

</pre>
  <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content">Issues Index</span><a class="self-link" href="#issues-index"></a></h2>
  <div style="counter-reset:issue">
   <div class="issue"> Support customized built-in elements. <a href="https://github.com/whatwg/html/issues/5166">[whatwg/html Issue #5166]</a> <a 