hello_world.html

<html>
<head>
  <title>Learn Javascript!</title>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <script type="text/javascript" src="lib/iokranf.js"></script>
</head>
<body>
<h1>Learn Javascript</h1>
<pre id="iokranf_container" style="height: 600px;"></pre>
<script>
"use strict";
var io=new IOKranf('iokranf_container');
(async function(){

  io.println('Hello World!');
 

})();</script>
</body>
</html>