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<!DOCTYPE html>
<title>Remove the first of two sibling elements in the fullscreen 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="a"></div>
<div id="b"></div>
<script>
promise_test(async (t) => {
t.add_cleanup(() => {
if (document.fullscreenElement) {
return document.exitFullscreen();
}
});
const a = document.getElementById("a");
const b = document.getElementById("b");
await Promise.all([trusted_request(a), fullScreenChange()]);
assert_equals(document.fullscreenElement, a, "fullscreen element after first request");
assert_true(a.matches(":fullscreen"), "a matches :fullscreen after first request");
await Promise.all([trusted_request(b, a), fullScreenChange()]);
assert_equals(document.fullscreenElement, b, "fullscreen element after second request");
assert_true(a.matches(":fullscreen"), "a matches :fullscreen after second request");
assert_true(b.matches(":fullscreen"), "b matches :fullscreen after second request");
// Removing /a/ now shouldn't do anything except remove it from the top
// layer, which causes it to no longer match :fullscreen.
a.remove();
assert_equals(document.fullscreenElement, b, "fullscreen element immediately after removal of a");
assert_false(a.matches(":fullscreen"), "a should no longer match :fullscreen immediately after removal");
assert_true(b.matches(":fullscreen"), "b matches :fullscreen immediately after removal of a");
// No fullscreenchange event should fire. If the removal triggered exiting
// fullscreen the event would be fired after an async section and an
// animation frame task, so wait until after that.
document.onfullscreenchange = t.unreached_func("fullscreenchange event");
await new Promise((resolve) => {
requestAnimationFrame(resolve);
});
});
</script>
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