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<!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>