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Test Info:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script>
window.onload = function(){
let x = document.getElementsByTagName("iframe")[0];
let w = window.open();
let o = window.frames[0];
x.remove();
o.requestIdleCallback(function(){});
w.close();
};
</script>
</head>
<body>
<iframe></iframe>
</body>
</html>