JSFiddle - React, Tailwind, and code Playground

HTML

<ul></ul>
<button>test</button>

CSS

ul:empty{
    background-color:green;
}
ul{
    width:100px;
    height:100px;
    background:red;
}

JavaScript

$(document).ready(function() {
    $('button').on('click', function() {
        console.log('ding');
        $('ul').append('<li>hi</li>');
    });
});