fullscreen/api/element-request-fullscreen-options.html

<!DOCTYPE html>
<title>Element#requestFullscreen({ navigationUI }) support</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
// Tests for https://github.com/whatwg/fullscreen/pull/129. Because there are
// no normative requirements on what navigationUI should do, just test for
// basic support. (One could also check that the three allowed enum valid are
// supported and no others, but that would overlap with UA-specific tests.)
promise_test(() => {
  let invoked = false;
  return document.body.requestFullscreen({
    get navigationUI() { invoked = true; return "irrelevant-value"; }
  }).then(() => {
    assert_unreached("promise should be rejected due to invalid navigationUI value");
  }, () => {
    assert_true(invoked, "navigationUI getter invoked");
  });
});
</script>