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chromium/third_party/blink/web_tests/external/wpt/close-watcher/esc-key/synthetic-keyboard-event.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="../resources/helpers.js"></script>

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

  let keydown = new KeyboardEvent("keydown", {key: "Escape", keyCode: 27});
  window.dispatchEvent(keydown);
  let keyup = new KeyboardEvent("keyup", {key: "Escape", keyCode: 27});
  window.dispatchEvent(keyup);

  assert_array_equals(events, []);

  let keyup2 = document.createEvent("Event");
  keyup2.initEvent("keyup", true);
  window.dispatchEvent(keyup2);

  assert_array_equals(events, []);
}, "close via synthesized Esc key must not work");
</script>