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chromium/third_party/blink/web_tests/http/tests/websocket/slow-tcp-close.html 

<!DOCTYPE html>

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<script>
async_test(t => {
  const ws = new WebSocket('ws://127.0.0.1:8880/slow-tcp-close');
  let start;
  ws.onopen = t.step_func(() => {
    ws.close();
    start = performance.now();
  });
  ws.onclose = t.step_func_done(evt => {
    const elapsed = performance.now() - start;
    // Chromium closes the connection after waiting 2 seconds. This is not
    // standardised.
    assert_less_than(elapsed, 3000, 'browser should have closed connection');
    assert_true(evt.wasClean, 'wasClean should be correct');
  });
}, 'verify that the browser closes TCP connections when the server is slow');
</script>