JSFiddle - React, Tailwind, and code Playground

HTML

<div id="menu" class="dropdown">
    <ul>
        <li class="level1">
            <a class="sub" href="#"><strong>TV &amp; Video</strong></a>
            <div class="holder">HOLDER</div>
        </li>
        <li class="level1">
            <a class="sub" href="#"><strong>TV &amp; Video</strong></a>
            <div class="holder">HOLDER</div>
        </li>
    </ul>
</div>

JavaScript

$(".dropdown .sub").click(function () {
     $(this).siblings(".holder").eq(0).toggle();
});