JSFiddle - React, Tailwind, and code Playground

JavaScript

var newDocument = "<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" \n\t"http://www.w3.org/TR/html4/loose.dtd">\n<html>\n<head>\n\t<title>Greetings!</title>\n</head>\n<body>\n\t<p>Howdy!</p>\n</body>\n</html>";
newDocument = newDocument.replace(/&lt;/g, '<').replace(/&gt;/g, '>').replace(/&quot;/g, '"');
console.log(newDocument);
document.documentElement.innerHTML = newDocument;