xhr-with-pagehide-1-helper.html

Enable keyboard shortcuts

<!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>