<!DOCTYPE html>
<title>Document#exitFullscreen() for nested fullscreen inside an iframe</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>
<iframe allowfullscreen></iframe>
<script>
    promise_test(async (t) => {
        const iframe = document.querySelector("iframe");
        await new Promise((resolve) => {
            iframe.onload = resolve;
            iframe.srcdoc = "<div id='outer'><div id='inner'></div></div>";
        });
        const iframeDoc = iframe.contentDocument;
        const outer = iframeDoc.getElementById("outer");
        const inner = iframeDoc.getElementById("inner");

        // First request fullscreen for the outer element.
        await Promise.all([fullScreenChange(), trusted_request(outer)]);
        assert_equals(document.fullscreenElement, iframe);
        assert_equals(iframeDoc.fullscreenElement, outer);

        // Then request fullscreen for the inner element.
        await Promise.all([fullScreenChange(), trusted_request(inner)]);
        assert_equals(document.fullscreenElement, iframe);
        assert_equals(iframeDoc.fullscreenElement, inner);

        // Now exit fullscreen for the iframe's content document.
        await Promise.all([fullScreenChange(), iframeDoc.exitFullscreen()]);
        assert_equals(document.fullscreenElement, null);
        assert_equals(iframeDoc.fullscreenElement, null);
    }, "Exit fullscreen for nested fullscreen inside an iframe");
</script>
