File: document-fullscreen-enabled-removing-allowfullscreen.sub.html

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<!DOCTYPE html>
<title>
    Document#fullscreenEnabled removing allowfullscreen after load and then
    navigating
</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<iframe></iframe>
<script>
    function requestStatus(iframe) {
        iframe.contentWindow.postMessage(
            "What is document.fullscreenEnabled?",
            "*"
        );
        return new Promise((resolve) => {
            window.addEventListener("message", function listener(e) {
                window.removeEventListener("message", listener);
                resolve(event.data);
            });
        });
    }

    promise_test(async (t) => {
        const iframe = document.querySelector("iframe");
        iframe.allowFullscreen = true;
        assert_true(iframe.allowFullscreen, "allowFullscreen is false");
        assert_true(
            iframe.hasAttribute("allowfullscreen"),
            "allowFullscreen attribute is present"
        );
        await new Promise((resolve) => {
            iframe.onload = resolve;
            const path = location.pathname.substring(
                0,
                location.pathname.lastIndexOf("/") + 1
            );
            iframe.src = `http://{{hosts[][]}}:{{ports[http][0]}}${path}resources/echo-fullscreenEnabled.html`;
        });

        assert_true(
            await requestStatus(iframe),
            "document.fullscreenEnabled in the iframe, before navigation"
        );

        iframe.allowFullscreen = false;
        assert_false(iframe.allowFullscreen, "allowFullscreen is false");
        assert_false(
            iframe.hasAttribute("allowfullscreen"),
            "allowFullscreen attribute is not present"
        );

        await new Promise((resolve) => {
            iframe.onload = resolve;
            iframe.contentWindow.location.href = iframe.src + "?2";
        });

        assert_false(
            await requestStatus(iframe),
            "document.fullscreenEnabled in the iframe, after navigation"
        );
    });
</script>