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chromium/third_party/blink/web_tests/external/wpt/close-watcher/user-activation/ynn-dialog.html 

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/common/top-layer.js"></script>
<script src="../resources/helpers.js"></script>

<body>
<script>
const type = "dialog";

promise_test(async t => {
  const events = [];

  await createBlessedRecordingCloseWatcher(t, events, "watcher1", type);
  createRecordingCloseWatcher(t, events, "watcher2", type);
  createRecordingCloseWatcher(t, events, "watcher3", type);

  await sendCloseRequest();
  await waitForPotentialCloseEvent();
  assert_array_equals(events, ["watcher3 cancel[cancelable=false]", "watcher2 cancel[cancelable=false]", "watcher3 close", "watcher2 close"]);

  await sendCloseRequest();
  await waitForPotentialCloseEvent();
  assert_array_equals(events, ["watcher3 cancel[cancelable=false]", "watcher2 cancel[cancelable=false]", "watcher3 close", "watcher2 close", "watcher1 cancel[cancelable=false]", "watcher1 close"]);
}, "Create a close watcher with user activation; create two close watchers without user activation");
</script>