JSFiddle - React, Tailwind, and code Playground

HTML

<div id="start">
    <div>
        <span>Hello world</span>
        <ul class="valid-result"> ... </ul>
        <ul class="valid-result">
            <li>
                <ul class="not-a-result"> not... </ul>
            </li>
        </ul>
        <div>
            <ul class="valid-result"> ... </ul>
        </div>
    </div>
</div>

JavaScript

$("#start").find("ul[class=valid-result]").css("background", "red");
$("#start").find("ul[class=not-a-result]").css("background", "white");