JSFiddle - React, Tailwind, and code Playground

HTML

<div class="one">
<p>First element</p>
</div>

<div class="two">
<p>Second element</p>
</div>

CSS

div{ background:tomato; color:white; margin: 30px; }

JavaScript

var clone = document.querySelectorAll(".one")[0].cloneNode(true);

document.querySelectorAll(".two")[0].appendChild(clone);

document.querySelectorAll(".two .one")[0].className = "cloned";