<!DOCTYPE html>
<html>
  <head>
    <title>Hello, world</title>
    <script src='app.js'></script>
  </head>
  <body>
  <h1>Async test...</h1>
  <button type="button" onclick="loadData()">Request data</button>
  <div id="test"></div>
  </body>
</html>
