<!DOCTYPE html>
<meta charset="utf-8">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
// This is a regression test for crbug.com/860063.
window.controller = new AbortController();
async_test(t => {
  onmessage = t.step_func(event => {
    assert_equals(event.data, 'started');
    const iframe = document.querySelector('iframe');
    document.body.removeChild(iframe);
    controller.abort();
    t.done();
  });
}, 'aborting a fetch in a destroyed context should not crash');
</script>
<iframe srcdoc="
                <!DOCTYPE html>
                <meta charset=utf-8>
                <script>
                fetch('../resources/infinite-slow-response.py', { signal: parent.controller.signal }).then(() => {
                  parent.postMessage('started', '*');
                });
                </script>
                ">
</iframe>