Example

The HTML page must be assembled as follows:

<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
    <meta name="viewport" content="width=device-width, initial-scale=1"/>
    <link href="http://danielfabbri.com/japu.css"  rel="stylesheet" />
    <script src="http://danielfabbri.com/japu.js"></script>
  </head>
  <body>
  </body>
</html>