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Test Info:

<!doctype html>
<html>
<head>
<script type="text/javascript">
function noop() {}
function crash() {
let div = document.querySelector("div");
let ifr = document.querySelector("iframe");
// We need a reference to the iframe's window from *before* it gets detached.
let win = ifr.contentWindow;
div.appendChild(ifr);
win.addEventListener("beforeunload", noop);
win.removeEventListener("beforeunload", noop);
}
</script>
</head>
<body onload="crash()">
<div></div>
<iframe></iframe>
</body>
</html>