The <header>HTML element represents introductory content, typically a group of introductory or navigational aids. It may contain some heading elements but also a logo, a search form, an author name, and other elements.
<header>
<a class="logo" href="#">Cute Puppies Express!</a>
</header>
<article>
<header>
<h1>Beagles</h1>
<time>08.12.2014</time>
</header>
<p>
I love beagles <em>so</em> much! Like, really, a lot. They're adorable and
their ears are so, so snugly soft!
</p>
</article>
When not nested within sectioning content, <main>, or an element with the same ARIA role as these elements' implicit ARIA role, then the <header> element has an identical meaning to the site-wide banner landmark role. It defines a global site header, which usually includes a logo, company name, search feature, and possibly the global navigation or a slogan. It is generally located at the top of the page.
Otherwise, when nested within said elements, it loses its landmark status and represents a group of introductory or navigational aids for the surrounding section. It usually contains the surrounding section's heading (an h1 – h6 element) and optional subheading, but this is not required.
The <header> element originally existed at the very beginning of HTML for headings. It is seen in the very first website. At some point, headings became <h1> through <h6>, allowing <header> to be free to fill a different role.
The <header> element defines a banner landmark when its context is the <body> element.
When placed inside an <article>, <main>, <section>, <nav>, <aside>, or an element with the same ARIA role as these elements' implicit ARIA role, the <header> element has the generic role instead, and is no longer considered a landmark. In this case, it cannot be labeled with aria-label or aria-labelledby.
<article>
<header>
<h2>The Planet Earth</h2>
<p>
Posted on Wednesday, <time datetime="2017-10-04">4 October 2017</time> by
Jane Smith
</p>
</header>
<p>
We live on a planet that's blue and green, with so many things still unseen.
</p>
<p><a href="https://example.com/the-planet-earth/">Continue reading…</a></p>
</article>
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