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chromium/third_party/blink/web_tests/external/wpt/streams/readable-streams/tee-detached-context-crash.html 

<!doctype html>
<body>
<script>
const i = document.createElement("iframe");
document.body.appendChild(i);

const rs = new i.contentWindow.ReadableStream();
i.remove();

// tee() on a ReadableStream from a detached iframe should not crash.
rs.tee();
</script>
</body>