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chromium/third_party/blink/web_tests/http/tests/websocket/disconnect-in-close-event.html 

<!doctype html>
<html>
<script src = "/resources/testharness.js"></script>
<script src = "/resources/testharnessreport.js"></script>
<iframe src="resources/empty.html"></iframe>
<script>
async_test((test) => {
  const iframe = document.querySelector('iframe');
  iframe.addEventListener('load', () => {
    const url = 'ws://127.0.0.1:8880/server-close';
    const ws = new iframe.contentWindow.WebSocket(url);
    ws.onclose = () => {
      iframe.remove();
      test.done();
    };
  });
}, 'Destroying the frame in the close event handler should not lead to crash.');
</script>
</html>