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The “navigation” role is unnecessary for element “nav”.

The navigation landmark role is used to identify major groups of links used for navigating through a website or page content. It can be added to an element that contains navigation links by using role="navigation", but instead it’s preferable to just use the <nav> element. In that case, it’s unnecessary to make the navigation role explicit. Examples:

<div role="navigation">
  <!-- this is a valid way to define a navigation role -->
</div>

<nav>
   <!-- but this is shorter and uses correct semantic HTML  -->
</nav>

Read more about the nav element and the ARIA Navigation Role.

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