Async wait Promise

<!DOCTYPE html>
<html lang="en">
<body>
    <script>
        function sleep(ms) {
            return new Promise(resolve => setTimeout(resolve, ms));
        }
        const annoncement = async () => {
            document.body.insertAdjacentHTML("afterBegin"
, `<h1 id="info">date: ${new Date().toLocaleDateString()}</h1>`);
            await sleep(3000)
            document.querySelector("#info").remove();
        }
        annoncement();
    </script>
</body>

</html>