JSFiddle - React, Tailwind, and code Playground
by toroncino
HTML
<ul>
<li>1</li>
<li>2</li>
<li>3
<ul>
<li>sub 1</li>
<li>sub 2</li>
</ul>
</li>
</ul>
CSS
/*ul ul li:last-child { color: red }*/
.last li:last-child { color: red }
JavaScript
$('ul').last().addClass('last');