File: element-request-fullscreen-dialog.html

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<!DOCTYPE html>
<title>Element#requestFullscreen() for dialog element</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>
<div id="log"></div>
<dialog></dialog>
<script>
    promise_test(async (t) => {
        const dialog = document.querySelector("dialog");
        assert_true(dialog instanceof HTMLDialogElement);
        document.onfullscreenchange = t.unreached_func(
            "fullscreenchange event"
        );
        const errorEventPromise = new Promise(
            (resolve) => (document.onfullscreenerror = resolve)
        );
        Promise.all([
            promise_rejects_js(t, TypeError, dialog.requestFullscreen()),
            errorEventPromise,
        ]);
    });
</script>