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chromium/third_party/blink/web_tests/external/wpt/webtransport/in-removed-iframe.https.html 

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
'use strict';
setup({ single_test: true });

function iframeOnLoad() {
  const target = document.querySelector('#target');
  const wt = target.contentWindow.wt;
  target.remove();
  const streams = wt.incomingBidirectionalStreams;
  assert_equals(typeof streams, 'object', 'streams should be an object');
  done();
}
</script>

<iframe id=target onload="iframeOnLoad()" srcdoc="
<!doctype html>
<script src=/common/get-host-info.sub.js></script>
<script src=resources/webtransport-test-helpers.sub.js></script>
<script>
window.wt = new WebTransport(webtransport_url('echo.py'));
</script>
"></iframe>