Footer in HTML5

How to create a valid footer in HTML 5?

Footer element represents a footer of its nearest ancestor element and can typically contains author information, copyright information, links etc.

    <h1>ASP.NET Articles</h1>
    <article>
        <h1>GridView articles</h1>
        <p>Description of all GridView articles</p>
        <!-- article footer -->
        <footer>posted by: Sheo Narayan</footer>
    </article>
    <article>
        <h1>Authentication & Authorization articles</h1>
        <p>Description of all Authentication & Authorization articles</p>
        <!-- article footer -->
        <footer>posted by: Sheo Narayan</footer>
    </article>
    <!-- website footer -->
    <footer>
        <a href="/contactus.aspx">Contact us</a> | <a href="/aboutus.aspx">About
us</a> |
    </footer>

Footer can be specified for