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Test Info:

<!DOCTYPE html>
<title>:fullscreen pseudo-class</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) => {
t.add_cleanup(() => {
if (document.fullscreenElement) {
return document.exitFullscreen();
}
});
const outer = document.querySelector("div");
const inner = outer.firstChild;
// First request fullscreen for the outer element.
await trusted_request(outer);
await fullScreenChange();
assert_equals(document.fullscreenElement, outer);
assert_true(
outer.matches(":fullscreen"),
"outer:fullscreen in simple fullscreen"
);
assert_false(
inner.matches(":fullscreen"),
"inner:fullscreen in simple fullscreen"
);
// Then request fullscreen for the inner element.
await trusted_request(inner);
// Although inner is the fullscreen element, both elements match the
// selector, as both have their fullscreen flag set.
assert_equals(document.fullscreenElement, inner);
assert_true(
inner.matches(":fullscreen"),
"inner:fullscreen in nested fullscreen"
);
assert_true(
outer.matches(":fullscreen"),
"outer:fullscreen in nested fullscreen"
);
});
</script>