<article>
<h1>What Does WWF Do?</h1>
<p>WWF's mission:</p>
<p>WWF's mission is to stop the degradation of our planet's natural environment,
and build a future in which humans live in harmony with nature.</p>
</article>
• Defines a header for a document or a section.
• Should be used as a container for introductory content.
• You can have several <header> elements in one document.