xmlhttprequest-in-pagehide-sync.html

<!DOCTYPE html>
<html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>

window.onpagehide = parent.t.step_func(() => {
  try {
    console.log("trying the synx xhr");
    var xhr = new XMLHttpRequest();
    xhr.open("GET", "resources/1251.html", false);
    xhr.send(null);
    assert_unreached('Sync XHR must throw during an pagehide event');
  } catch (e) {
    parent.t.done();
  }
});

</script>
</head>
<body>
</body>
</html>

chromium/third_party/blink/web_tests/http/tests/xmlhttprequest/resources/xmlhttprequest-in-pagehide-sync.html