<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
async_test(t => {
  window.onload = t.step_func(() => {
    let abort_signal;
    let onabort_called = false;
    navigation.onnavigatesuccess = t.unreached_func("onnavigatesuccess");
    navigation.onnavigate = t.step_func(e => {
      abort_signal = e.signal;
      abort_signal.onabort = () => onabort_called = true;
    });
    navigation.navigate("?1");
    window.stop();
    assert_true(abort_signal.aborted);
    assert_true(onabort_called);
    // Complete the test asynchronously to ensure that onnavigatesuccess
    // didn't fire on a microtask.
    t.step_timeout(t.step_func_done(() => {}), 0);
  });
}, "window.stop() signals event.signal");
</script>
