Ejemplo:
<section>
<h1> Forest elephants </h1>
<section>
<h1> Introduction </h1>
<p>In this section, we discuss the lesser known forest elephants.
</section>
<section>
<h1> Habitat </h1>
<p> Forest elephants do not live in trees but among them.
</section>
<aside>
<p>advertising block
</aside>
</section>
<footer>
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</footer>