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chromium/third_party/blink/web_tests/external/wpt/dom/abort/abort-signal-timeout.html 

<!DOCTYPE HTML>
<meta charset=utf-8>
<title>AbortSignal.timeout frame detach</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="iframe"></iframe>
<script>
  async_test(t => {
    const signal = iframe.contentWindow.AbortSignal.timeout(5);
    signal.onabort = t.unreached_func("abort must not fire");

    iframe.remove();

    t.step_timeout(() => {
      assert_false(signal.aborted);
      t.done();
    }, 10);
  }, "Signal returned by AbortSignal.timeout() is not aborted after frame detach");
</script>