JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li></li>
    <li></li>
    <li></li>
</ul>

CSS

li {
    display: inline-block;
    width:50px;
    height:50px;
    background: #555;
}

JavaScript

$('ul').find('li').each(function(){
    $('ul').append($(this).clone());
});