Bootstrap HTML Validator Warning: Element nav does not need a role attribute -

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i have insert menu in index:

<nav id="mainmenu" class="navbar navbar-default" role="navigation">

but when try validate (in local) validator.w3 tell me:

warning: element nav not need role attribute.

i can't find solution, can me?

delete role="navigation".

the <nav> element has semantics of being navigation. don't need add them role attribute. saying "this navigation element navigation" redundant , silly.

<nav id="mainmenu" class="navbar navbar-default">

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