ajax_data_retrieve_problem.html

<!DOCTYPE html>
<html>
<head>
  <title>AJAX demo</title>
  <style type="text/css">
    .output{
      border: 2px solid red;
    }
  </style>
</head>
<body>
  <button class="getDataBtn">Get data</button>
  <div class="output"></div>

  <script type="text/javascript" src="main.js"></script>
</body>
</html>