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<!DOCTYPE html>
<title>Document#exitFullscreen() for nested fullscreen</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><div></div></div>
<script>
promise_test(async (t) => {
const outer = document.querySelector("div");
const inner = outer.firstChild;
document.onfullscreenerror = t.unreached_func("fullscreenerror event");
// First request fullscreen for the outer element.
await Promise.all([
fullScreenChange(),
trusted_request(outer),
]);
assert_equals(document.fullscreenElement, outer);
// Then request fullscreen for the inner element.
const p = trusted_request(inner);
// Even though we are already in fullscreen, the change in
// document.fullscreenElement should not happen synchronously.
assert_equals(document.fullscreenElement, outer);
await Promise.all([
fullScreenChange(),
p,
]);
assert_equals(document.fullscreenElement, inner);
// Now exit fullscreen.
const exitP = document.exitFullscreen();
// Even though we don't need to exit fullscreen, the change in
// document.fullscreenElement should not happen synchronously.
assert_equals(document.fullscreenElement, inner);
await Promise.all([
exitP,
fullScreenChange(),
]);
assert_equals(document.fullscreenElement, outer);
}, "Exit fullscreen for nested fullscreen");
</script>
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