JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>a</li>
    <li>b</li>
    <li>c</li>
    <li>d</li>
    <li>e</li>
</ul>

CSS

li {
  width: 100px;
  background: green;
}

JavaScript

$.when($('li').animate({width: 200}, 'slow')).then(function () {
  console.log('done');
});