JSFiddle - React, Tailwind, and code Playground

HTML

<div class="content">
    <ol>
        <li>item1</li>
        <li>item2</li>
        <li>item3</li>
    </ol>
</div>
<div id="count"></div>

JavaScript

$(function() {
    $("#count").html($(".content").find("li").length);
});