</code>, and the latter is the <a data-link-type="dfn" href="#custom-state-pseudo-class" id="ref-for-custom-state-pseudo-class①">custom state pseudo class</a>.</p>
   <div class="example" id="ex-intro">
    <a class="self-link" href="#ex-intro"></a>


    <p>Assume that <code>LabeledCheckbox</code> doesn’t expose its "checked" state
via a content attribute.</p>
<pre class="lang-html highlight"><c- cp>&lt;!DOCTYPE html></c->
<c- p>&lt;</c-><c- f>body</c-><c- p>></c->
<c- d>&lt;!-- Basic usage: --></c->
<