JSFiddle - React, Tailwind, and code Playground

by petroveg

HTML

<div id="test">
	<div id="x">
		<span>678</span>
	</div>
</div>

JavaScript

var div1 = document.getElementById('test'),
	div2 = document.getElementById('x'),
	span = div2.getElementsByTagName('span')[0];

div1.innerHTML = '<span>123</span>';
alert(document.contains(span));