<!DOCTYPE html>
<html>
<head>
<script>
function redirectAndFireXHR() {
  const XHR = new XMLHttpRequest();
  document.location.assign('data:text/html,final iframe content');
  XHR.open('GET', 'data:text/html,1', false);
  XHR.send();
}

function handlePageHide() {
  window.parent.finishTest();
}
</script>
</head>
<body onload="redirectAndFireXHR()"
      onpagehide="handlePageHide()">
initial iframe content
</body>
</html>
