<script>
onload = function() {
  if (document.referrer == sessionStorage.expectedReferrer) {
    document.body.innerText = "PASS";
  } else {
    document.body.innerText = "FAIL: document.referrer is \'" + document.referrer + "\'";
  }
  if (window.testRunner)
    testRunner.notifyDone();
}
</script>