JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="dropdown">
    <li>Test
        <ul>
            <li>Test1</li>
            <li>Test2</li>
            <li>Test3</li>
        </ul>
    </li>
</ul>

CSS

.dropdown ul{
    display:none;
}

JavaScript

$(document).ready(function() {
    $(".dropdown li").hover(function() {
        $(ul).show();
    }, function() {
        $(ul).hide();
    });
});