JSFiddle - React, Tailwind, and code Playground

HTML

<p id="parent_id">thing <span class="class1">thing</span> thing <span class="class2">thing</span></p>

<p id="parent_id1">thing <span class="class1">thing</span> thing <span class="class2">thing</span></p>

JavaScript

$('.class1, .class2, .class3', $('#parent_id')).css('color','red');