Problème mode plein écran javascript [Fermé]

Uncaught (in promise) TypeError: fullscreen error
    at openFullscreen (<anonymous>:6:14)
    at <anonymous>:32:13

<img src="atfrc/GE001.png" height="0" width="0" id="bt3_001"></img>

function sleep(ms) {
    return new Promise(resolve => setTimeout(resolve, ms));
}
function openFullscreen(elem) {
    if (elem.requestFullscreen) {
        elem.requestFullscreen();
    } else if (elem.mozRequestFullScreen) { /* Firefox */
        elem.mozRequestFullScreen();
    } else if (elem.webkitRequestFullscreen) { /* Chrome, Safari and Opera */
        elem.webkitRequestFullscreen();
    } else if (elem.msRequestFullscreen) { /* IE/Edge */
        elem.msRequestFullscreen();
    }
}
function closeFullscreen() {
    if (document.exitFullscreen) {
        document.exitFullscreen();
    } else if (document.mozCancelFullScreen) { /* Firefox */
        document.mozCancelFullScreen();
    } else if (document.webkitExitFullscreen) { /* Chrome, Safari and Opera */
        document.webkitExitFullscreen();
    } else if (document.msExitFullscreen) { /* IE/Edge */
        document.msExitFullscreen();
    }
}

sleep(5000).then(() => {
    openFullscreen(bt3_001);
    sleep(5000).then(() => {
        closeFullscreen(bt3_001);
        sleep(5000).then(() => {
            openFullscreen(bt3_001);
        })
    })
});