Several headerelements are allowed , and each of them indicates "introductory content for its nearest section or sectional root element", i.e. nearest enclosed item, to the side, nav, section, blockquote, body, details, dialog, fieldset, figure or td element. So you can have, for example,
<body>
<header>body header</header>
...
<article>
<header>article header</header>
...
</article>
, , header ( ) article. " " . , , header , header .