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<!DOCTYPE HTML>
<html>
<body><iframe srcdoc="
<html>
<head>
<script>
onload = function() {
// Ensure the layout is up-to-date and painted.
requestAnimationFrame(function() {
setTimeout(run);
})
}
function run() {
parent.opener.postMessage('doscroll', '*');
window.onscroll = function() {
parent.opener.postMessage('didscroll', '*');
}
let xhr = new XMLHttpRequest();
xhr.open('GET', 'slow.sjs', false);
xhr.send();
parent.opener.postMessage('xhr_done', '*');
}
</script>
</head>
<body style='height: 3000px; border: 1px solid black;'>
</body>
</html>
"></iframe></body>
</html>
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