JSFiddle - React, Tailwind, and code Playground

by Kai

HTML

<span rel="kai">Kai</span>
<span rel="khary">Khary</span>

JavaScript

// IE
var elements = document.querySelectorAll('*[rel]') || document.evaluate("//*[@rel]", document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null) || 
    oXmlDom.documentElement.selectNodes("[@rel]");

alert(elements.length);