JSFiddle - React, Tailwind, and code Playground

HTML

<div id="t1"><div class="test">A</div></div>
<div id="t2"><div class="test">B</div></div>
<div id="t3"><div class="test">C</div></div>

JavaScript

var a = $('#t2');
var b = $('#t3');

$('.test', b, a).css({'color': 'red'});