open_in_new content_copy 
<html>
    <body>
        <header>
            <nav>
                <ul>
                    <li>Header-One</li>
               </ul>
            </nav>
        </header>
        <main>
            <section >Main-content-one</section>
        </main>
        <footer>
            <section >Footer-one</section>
        </footer>
    </body>
</html>