<!DOCTYPE html>
<html>
<head>
  <script type="text/javascript">
    i = 0;
    timeout_handle = window.setTimeout(timeoutCallback, 500);
    inteval_handle = window.setInterval(intervalCallback, 500);

    function timeoutCallback() {
      console.log("Timeout!");
    }

    function intervalCallback() {
      i = i + 1;
      console.log("Interval #" + i + "!");
    }
  </script>
</head>

<body>
</body>
</html>