JSFiddle - React, Tailwind, and code Playground

HTML

<div class="first">
    <div>Test 1</div>
    <div>Test 2</div>
    <div>Test 3</div>
</div>
<div class="second">
    
</div>

JavaScript

var nl = document.querySelector(".first").childNodes,
    parent = document.querySelector(".second");

var fragment = document.createDocumentFragment();

while(nl.length) 
    fragment.appendChild(nl[0]);

parent.appendChild(fragment);