soria/nihilo no focus indication on tabs and accordian containers

[nonken]

Both soria and nihilo have a :focus { -moz-outline-style: none; } which should not be there

[bill]

i think that :focus { -moz-outline-style: none; } is there on-purpose to make it look prettier (at the cost of a11y). Idea was to have some other way to show focus, like an underline or bold. Of course that brings up all sorts of philosophical issues like whether or not the user will realize what underline means (it typically means "this is a link").

IIRC we only guaranteed a11y for tundra, although it would definitely be nice to have it for the other themes too.

I don't care personally though.

[nonken]

(In [12427]) Deletes focus: none, fixes #5848