<header> ... </header>
HTML5 only. Represents information that goes at the beginning of a section,
most often the headline, but the
header may also include navigation links,
advertising, introductions, etc. It may contain any flow content
<p>Welcome to the White Rabbits fan site.</p>
<h2>Rabbit Sightings</h2> ... markup continues ... </body>
header is a semantic section element. Its rendering is dependent on style rules.