HTML5 Page Article Tag and Page Structure Tags

header, footer, nav, article, section, aside, hgroup

HTML5 introduced several page structure tags. The <header> tag is used to enclose a page header content. It's a substitute for like <div class="header">…</div>. Similarly for all the other tags: header, footer, nav, article, section, aside. The “aside” is sidebar.

View Source to learn.

This is a section content.

Note that there is no layout/formatting associated with these tags by default. You have to define your own with CSS.