El algoritmo de perfilado de HTML5

Ejemplo

<section>
   <h1> Forest elephants </h1>
<section>
   <h1> Introduction </h1>
   <p> In this section, we discuss the lesser known forest elephants. </p>
</section>
<section>
   <h1> Habitat </h1>
   <p> Forest elephants do not live in trees but among them. </p>
</section>
<aside>
   <p> advertising block
</aside>
</section>
<footer>
   <p> (c)2010 The example company
</footer>