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.createElement('div');

document.body.appendChild(frag);
frag.setAttribute('id', 'frag');
frag.appendChild(z);
frag.appendChild(x);

var b = '"'+frag.innerHTML+'"';
document.getElementById('frag').remove();
alert(b);