JSFiddle - React, Tailwind, and code Playground

HTML

<div id="z">z</div>
<div id="x">x</div>

JavaScript

var z = document.getElementById('z').cloneNode(true);
var x = document.getElementById('x').cloneNode(true);
/*var frag = document.createDocumentFragment();
frag.appendChild(z);
frag.appendChild(x);
console.log(frag.innerHTML)*/