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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script>
function go() {
document.body.appendChild(a)
window.frames[0].onbeforeunload = document.createElement("body").onload;
window.requestIdleCallback(() => {
window.close();
finish();
});
}
</script>
</head>
<body onload="go()">
<iframe id="a"></iframe>
<iframe></iframe>
</body>
</html>