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chromium/third_party/blink/web_tests/external/wpt/screen-orientation/resources/sandboxed-iframe-locking.html 

<!DOCTYPE html>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script>
test_driver.set_test_context(parent);

// At first, run simple unlock test without lock.
screen.orientation?.unlock();

test_driver.bless("request full screen", async () => {
  const data = {};
  try {
    await document.documentElement.requestFullscreen();
    await screen.orientation.lock("portrait")
    data.result = "locked";
    data.orientation = screen.orientation.type;
  } catch (error) {
    data.result = "errored";
    data.name = error.name;
  }

  screen.orientation.unlock();
  try {
    await document.exitFullscreen();
  } catch (error) {
    data.result = "errored";
    data.name = error.name;
  }

  parent.window.postMessage(data, "*");
});
</script>