JSFiddle - React, Tailwind, and code Playground

HTML

<p><iframe src="http://www.whatwg.org/specs/web-apps/current-work/"></iframe></p>

JavaScript

document.addEventListener('DOMContentLoaded', function () {
  document.body.appendChild(document.createTextNode('DOMContentLoaded'));
}, false);
window.addEventListener('load', function () {
   document.body.appendChild(document.createTextNode(', window load'));
}, false);