The first commented line is your dabblet’s title

dabblet.css

/**
 * @counter-style
 */

ul,dl{
background:red;
}

li::marker{
color:blue;
content:"lkl";
}

dabblet.html

<ul>
<li>taratata</li>
<li>tirititi</li>
</ul>
espace
<dl>
<dt>terme</dt>
<dd>définition</dd>
</dl>

settings.json

{"view":"split","prefixfree":"1","page":"css"}