);
            const myHello = document.querySelector('my-hello');
            const m = new MutationObserver(() => {
                span.textContent = myHello.outerHTML.replace(/\>.*\<\//g, '><');
            });
            m.observe(myHello, { attributes: true, childList: true });
        </script>
        <script src="demo5.js"></script></script>
    </body>
</html>