[Feature request] Add focus-visible WICG polyfill

[toddparker]

What

The new focus-visible CSS4 spec allows a developer to get rid of the focus outline if you interacted with a mouse or touch to avoid the messiness of the focus outline while maintaining accessibility.

Spec:
https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo

Explainer:
https://github.com/WICG/focus-visible/blob/master/explainer.md

Details

This is semi-official polyfill because it's maintained by WICG. Based on the proposed CSS :focus-visible pseudo-selector, this prototype adds a focus-visible class to the focused element, in situations in which the :focus-visible pseudo-selector should match.

https://github.com/WICG/focus-visible

Additional information

[JakeChampion]

Hi @toddparker, polyfill.io does not aim to polyfill CSS features such as this because they are not yet possible to do correctly, you can see this with the focus-visible polyfill as it requires using a specific classname to work.

When CSS Houdini has landed in stable browsers, polyfill.io may start supporting CSS polyfills.

[toddparker]

Thanks for the quick reply @JakeChampion. Should I close this then?