This element represents a section of a page that links to other pages or to parts within the page: a section with navigation links.
<nav class="class-name" id="nav-id-name" role="navigation">
This is a NAV element
</nav>
This element represents nothing if scripting is enabled, and represents its children if scripting is disabled. It is used to present different markup to user agents that support scripting and those that don't support scripting, by affecting how the document is parsed.
<noscript>Your browser does not support JavaScript</noscript>