document-exit-fullscreen-nested-in-iframe.html

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This WPT test may be referenced by the following Test IDs:
- /fullscreen/api/document-exit-fullscreen-nested-in-iframe.html - WPT Dashboard Interop Dashboard

<!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>

    async function fullscreenNestedElements(iframe, outer, inner) {

        // First request fullscreen for the outer element.

        await Promise.all([fullScreenChange(), trusted_request(outer)]);

        assert_equals(document.fullscreenElement, iframe);

        assert_equals(iframe.contentDocument.fullscreenElement, outer);

        // Then request fullscreen for the inner element.

        await Promise.all([fullScreenChange(), trusted_request(inner)]);

        assert_equals(document.fullscreenElement, iframe);

        assert_equals(iframe.contentDocument.fullscreenElement, inner);

    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");

        // Fullscreen outer, then inner, 2 elements in toplayer of <iframe>

        await fullscreenNestedElements(iframe, outer, inner);

        // Check if iframe sees (fullscreenchange, element) as per spec

        await Promise.all([fullScreenChange(iframeDoc), iframeDoc.exitFullscreen()]);

        // First iframe.contentDocument.exitFullscreen()

        // should only remove 1 from the top layer of iframe

        assert_equals(iframeDoc.fullscreenElement, outer);

        assert_equals(document.fullscreenElement, iframe);

        // Second exitFullscreen should exit fully from fullscreen, as stated by

        // https://fullscreen.spec.whatwg.org/#collect-documents-to-unfullscreen, since

        // all documents are now simple fullscreen documents

        // https://fullscreen.spec.whatwg.org/#simple-fullscreen-document

        await Promise.all([fullScreenChange(document), iframeDoc.exitFullscreen()]);

        assert_equals(iframeDoc.fullscreenElement, null);

        assert_equals(document.fullscreenElement, null);

        await fullscreenNestedElements(iframe, outer, inner);

        // Exit the top level document from fullscreen - should exit all documents below it as

        // per step 13 & 15 in https://fullscreen.spec.whatwg.org/#exit-fullscreen

        await Promise.all([fullScreenChange(document), document.exitFullscreen()]);

        assert_equals(iframeDoc.fullscreenElement, null);

        assert_equals(document.fullscreenElement, null);

    }, "Exit fullscreen for nested fullscreen inside an iframe");

</script>