third_party/web_platform_tests/XMLHttpRequest/event-abort.htm

<!doctype html>
<html>
  <head>
    <title>XMLHttpRequest: abort event</title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onabort" data-tested-assertations="../.." />
    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-abort" data-tested-assertations="../.." />
    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-xmlhttprequest-abort" data-tested-assertations="following::ol//ol//ol/li[3]" />
  </head>
  <body>
    <div id="log"></div>
    <script>
      var test = async_test();
      test.step(function() {
        var client = new XMLHttpRequest();
        client.onabort = test.step_func(function() {
          test.done();
        });
        client.open("GET", "resources/well-formed.xml");
        client.send(null);
        client.abort();
        setTimeout(test.step_func(function () {
          assert_unreached("onabort not called after 4 ms");
        }), 4);
      });
    </script>
  </body>
</html>