<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>Blank</title>
  </head>
  <body onload="notifyOnload();">
    <script type="application/javascript">
    function notifyOnload() {
      opener.postMessage({event: 'load'}, '*');
    }
    </script>
  </body>
</html>
