Nav bar "The aria-controls attribute..." W3 shows invalid code

[MeegB]

Hi, W3 validator showing error on

<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navigation" aria-controls="navigation-index" aria-expanded="false" aria-label="Toggle navigation">
The aria-controls attribute must point to an element in the same document.

Is there a way around this?

[dragosct]

Hi, @MeegB! Thanks for using our products. This code is from the Bootstrap official website, so this is their syntax code.

Regards,
Dragos