third_party/blink/web_tests/wpt_internal/geolocation-api/getCurrentPosition_visibility.https.html

<!DOCTYPE HTML>
<meta charset='utf-8'>
<title>Geolocation Test: getCurrentPosition returns after visibilityState changes</title>
<link rel='help' href='http://www.w3.org/TR/geolocation-API/#get-current-position'>
<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>

<p>Clear all Geolocation permissions before running this test. If prompted for permission, please allow.</p>
<div id='log'></div>

<script>
setup(test_driver.set_permission({name: 'geolocation'}, 'granted', true));

promise_test(async t => {
  assert_equals(document.visibilityState, "visible");

  const gcp = new Promise(resolve => navigator.geolocation.getCurrentPosition(
    p => resolve(pos),
    e => resolve(e),
    {timeout: 100, maximumAge: 0}))
  await gcp;

  const changed = new Promise(resolve => document.addEventListener("visibilitychange", resolve, {once:true}));
  testRunner.setMainWindowHidden(true);
  await changed;
  assert_equals(document.visibilityState, "hidden");

  const gcp2 = new Promise(resolve => navigator.geolocation.getCurrentPosition(
    p => resolve(pos),
    e => resolve(e),
    {timeout: 100, maximumAge: 0}));

  const changed2 = new Promise(resolve => document.addEventListener("visibilitychange", resolve, {once:true}));
  testRunner.setMainWindowHidden(false);
  await changed2;
  assert_equals(document.visibilityState, "visible");

  await gcp2;
}, "getCurrentPosition returns after visibilityState changes");
</script>