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chromium/third_party/blink/web_tests/external/wpt/html/webappapis/structured-clone/structured-clone-detached-window-crash.html 

<!doctype html>
<title>window.structuredClone() doesn't crash when window is detached</title>
<link rel="help" href="https://crbug.com/1445375">
<body>
<script>
let i = document.createElement("iframe");
document.body.appendChild(i);
let i_win = i.contentWindow;
i.remove();
i_win.structuredClone("some data");
</script>