JSFiddle - React, Tailwind, and code Playground

HTML

<body>

<span>

<strong>

<span><!-- If this <span> does not exist, then the <a> will be found. -->

<em>

<a href="#">a</a>

</em>

</span>

</strong>

</span>

</body>

JavaScript

alert($("body > span a").size());