fullscreen/model/remove-first.html

<!DOCTYPE html>
<title>Remove the first element on the fullscreen element stack</title>
<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="../trusted-click.js"></script>
<div id="log"></div>
<div id="first">
  <div id="last"></div>
</div>
<script>
  promise_test(async (t) => {
    t.add_cleanup(() => {
      if (document.fullscreenElement) {
        return document.exitFullscreen();
      }
    });
    const first = document.getElementById("first");

    const [, firstEvent] = await Promise.all([
      trusted_request(first),
      fullScreenChange(),
    ]);
    assert_equals(document.fullscreenElement, first, "fullscreen element after first request");
    assert_equals(firstEvent.target, first, "first fullscreenchange event target");

    const last = document.getElementById("last");
    const [, secondEvent] = await Promise.all([
      trusted_request(last),
      fullScreenChange(),
    ]);
    assert_equals(document.fullscreenElement, last, "fullscreen element after second request");
    assert_equals(secondEvent.target, last, "second fullscreenchange event target");
    first.remove();

    // Both /first/ and /last/ were removed from the top layer and
    // thus the fullscreen element synchronously becomes null.
    assert_equals(document.fullscreenElement, null, "fullscreen element immediately after removal");

    const thirdEvent = await fullScreenChange();
    assert_equals(document.fullscreenElement, null, "fullscreen element after third event");
    assert_equals(thirdEvent.target, document, "third fullscreenchange event target");
  });
</script>