JSFiddle - React, Tailwind, and code Playground

by Daniel Tan

HTML

<p><button>Add new item</button></p>
<ul>
    <li>1</li>
    <li>2</li>
    <li>3</li>
    <li>4</li>
    <li>5</li>
    <li>6</li>
</ul>

CSS

ul li:nth-last-child(2) { color: red; }

JavaScript

$('button').click(function() {
    var n = $('ul li').length;
    $('ul').append('<li>' + (n + 1) + '</li>');
});