No button "focus"

[devinreams]

Perhaps to be captured at #133 but worth mentioning:

It's unclear in the current button draft if / what a "focus" state for buttons should be.

This is important for those using keyboards to navigate page elements.

Originally pointed out here: mozilla-lockwise/lockbox-extension#277

[brassy-]

Hey @devinreams! We're working closely with Photon team to have a decision on focus for buttons and all the other components. We're going to have an answer next week or the week after it.