<html>
<head>
  <script>
    function clickLink()
    {
      var evt = document.createEvent("MouseEvent");
      evt.initMouseEvent("click", true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
      var link = document.querySelector('a');
      link.dispatchEvent(evt);
    }
  </script>
</head>
<body>
  <a href="#anchor">Link to anchor</a><br>
  In between.<br>
  <span id="anchor">Anchor</span><br>
  After the anchor.<br>
  </body>
</html>