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chromium/third_party/blink/web_tests/external/wpt/screen-wake-lock/wakelock-released.https.html 

<!DOCTYPE html>
<link rel="help" href="https://w3c.github.io/screen-wake-lock/#dom-wakelocksentinel-released">
<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>
promise_test(async t => {
  await test_driver.set_permission({ name: 'screen-wake-lock' }, 'granted');

  const lock = await navigator.wakeLock.request("screen");
  assert_false(lock.released, "lock.released must be false on creation");

  lock.onrelease = t.step_func(() => {
    assert_true(lock.released, "WakeLockSentinel.released is true in an onrelease event handler");
  });
  await lock.release();
  assert_true(lock.released, "WakeLockSentinel.released remains true outside the event handler");
}, "The released attribute inside an event handler");
</script>