tracker.html

<script type="text/javascript">
var _trackr_config={domain:"google.com"};
(function(){
  function loadChartbeat() {
    window._sf_endpt=(new Date()).getTime();
    var e = document.createElement('script');
    e.setAttribute('src',"//localhost:3000/trackr-local.js");
    document.body.appendChild(e);
  }
  var oldonload = window.onload;
  window.onload = (typeof window.onload != 'function') ?
     loadChartbeat : function() { oldonload(); loadChartbeat(); };
})();
</script>