JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <link rel="import" href="sample.html">
</head>

<body>
  <p>top</p>
  <iframe src="sample.html" frameborder="0" id="myframe"></iframe>
  <p>bottom</p>
  <textarea cols="30" rows="10"></textarea>
</body>

</html>

JavaScript

var node = document.doctype;

console.log(node);

var all = document.getElementsByTagName("*");

for (var i=0, max=all.length; i < max; i++) {
     console.log(all[i]);
}