Allow to use `hidden` attribute instead of `aria-hidden`

[ryuran]

Hello.
Tablist only manage aria-hidden attribute for tab panels.
It could manage hidden element for modern browsers.
https://developer.mozilla.org/fr/docs/Web/HTML/Attributs_universels/hidden

[enwin]

Yes!

I noticed that the latest version of the WAI-ARIA Authoring Practices was using the hidden attribute instead of aria-hidden (https://www.w3.org/TR/wai-aria-practices-1.1/#tabpanel). We'll look into adding the support of the attribute while keeping aria-hidden for backward compatibility 👍