JSFiddle - React, Tailwind, and code Playground

HTML

<div id="parent">
    <div class="child">
        <span>1</span>
    </div>
    <div class="child">
        <span>2</span>
    </div>
    <div class="child">
        <span>3</span>
    </div>
</div>

JavaScript

alert($(".child").find("span:last").length);

alert($(".child").find("span")jjn

alert($(".child span:last").length);