This was flagged by a recent Lighthouse audit, and may affect Google Search due to being included by PageSpeed Insights and Search Console as of last year.
>>! From <https://web.dev/measure/> for <https://en.wikipedia.org/wiki/Barrack_Obama>
> **`[aria-*]` attributes do not have valid values**
> Assistive technologies, like screen readers, can't interpret ARIA attributes with invalid values.
>
> ```name=Failing Elements,counterexample,lang=html
> <nav class="minerva-user-navigation" aria-labelledby="minerva-user-menu-toggle"> <div><button id="searchIcon" class="mw-ui-icon mw-ui-icon-element mw-ui-icon-wikimedia-search-base20 skin-minerva-search-trigger" type="submit">Search</button></div> </nav>
> ```
I've confirmed against production page views that the navigation element indeed points to `minerva-user-menu-toggle` but there appears to be no `id="minerva-user-menu-toggle"` element in the HTML.
= QA
* Visit https://en.m.wikipedia.beta.wmflabs.org/wiki/Barack%20Obama in Google Chrome
* Open developer tools and click audit tab
* Under audits make sure only accessibility is checked
* Click "run audits"
* In the report there should be no mention of "[aria-*] attributes do not have valid values". The score should be higher than or at least equal to 93. Please report here with the score.