fullscreen/api/element-request-fullscreen.html

<!DOCTYPE html>
<title>Element#requestFullscreen()</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>
<script>
    promise_test(async function (t) {
        const div = document.querySelector("div");
        await Promise.all([fullScreenChange(), trusted_request(div)]);
        assert_equals(event.target, div, "event.target");
        assert_true(event.bubbles, "event.bubbles");
        assert_false(event.cancelable, "event.cancelable");
        assert_true(event.composed, "event.composed");
        await document.exitFullscreen();
    });
</script>