chromium/third_party/blink/web_tests/external/wpt/close-watcher/inside-event-listeners.html

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<body>
<script>
promise_test(async t => {
  let events = [];
  let watcher = createRecordingCloseWatcher(t, events);

  watcher.oncancel = () => { watcher.destroy(); }

  await test_driver.bless("give user activation so that cancel will fire", () => {
    watcher.requestClose();
  });
  assert_array_equals(events, ["cancel[cancelable=true]"]);

  watcher.requestClose();
  assert_array_equals(events, ["cancel[cancelable=true]"], "since it was inactive, no more events fired");
}, "destroy() inside oncancel");

test(t => {
  let events = [];
  let watcher = createRecordingCloseWatcher(t, events);

  watcher.onclose = () => { watcher.destroy(); }

  watcher.requestClose();
  assert_array_equals(events, ["cancel[cancelable=false]", "close"]);

  watcher.requestClose();
  assert_array_equals(events, ["cancel[cancelable=false]", "close"], "since it was inactive, no more events fired");
}, "destroy() inside onclose");

promise_test(async t => {
  let events = [];
  let watcher = createRecordingCloseWatcher(t, events);

  watcher.oncancel = () => { watcher.close(); }

  await test_driver.bless("give user activation so that cancel will fire", () => {
    watcher.requestClose();
  });
  assert_array_equals(events, ["cancel[cancelable=true]", "close"]);

  watcher.requestClose();
  assert_array_equals(events, ["cancel[cancelable=true]", "close"], "since it was inactive, no more events fired");
}, "close() inside oncancel");

test(t => {
  let events = [];
  let watcher = createRecordingCloseWatcher(t, events);

  watcher.onclose = () => { watcher.close(); }

  watcher.requestClose();
  assert_array_equals(events, ["cancel[cancelable=false]", "close"]);

  watcher.requestClose();
  assert_array_equals(events, ["cancel[cancelable=false]", "close"], "since it was inactive, no more events fired");
}, "close() inside onclose");

promise_test(async t => {
  let events = [];
  let watcher = createRecordingCloseWatcher(t, events);

  watcher.oncancel = () => { watcher.requestClose(); }

  await test_driver.bless("give user activation so that cancel will fire", () => {
    watcher.requestClose();
  });
  assert_array_equals(events, ["cancel[cancelable=true]", "close"]);

  watcher.requestClose();
  assert_array_equals(events, ["cancel[cancelable=true]", "close"], "since it was inactive, no more events fired");
}, "requestClose() inside oncancel");

test(t => {
  let events = [];
  let watcher = createRecordingCloseWatcher(t, events);

  watcher.onclose = () => { watcher.requestClose(); }

  watcher.requestClose();
  assert_array_equals(events, ["cancel[cancelable=false]", "close"]);

  watcher.requestClose();
  assert_array_equals(events, ["cancel[cancelable=false]", "close"], "since it was inactive, no more events fired");
}, "requestClose() inside onclose");
</script>