Support css-counter-styles-3

[r12a]

Bugs have been created asking 3 major browsers to implement customisable counter styles per the CSS Counter Styles spec, which is in CR. (Firefox already has support.)

Blink:
https://bugs.chromium.org/p/chromium/issues/detail?id=687225 ETA M91
(duplicate: https://bugs.chromium.org/p/chromium/issues/detail?id=625771#c5)

Webkit:
https://bugs.webkit.org/show_bug.cgi?id=167645
https://bugs.webkit.org/show_bug.cgi?id=223150

Obsolete, Edge:
https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/10809826/

[xfq]

In https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/10809826/ :

Feature requests should go to our uservoice. We only track bugs here.

So I posted a feature request here: https://wpdev.uservoice.com/forums/257854-microsoft-edge-developer/suggestions/32403796-support-for-counter-style

Hope that helps.

[r12a]

Thanks @xfq .