Imagine if your :focus styles animated from element to element as you tab through a site. Like the focus ring up and flew across the page to the next element. The spirit of it is similar to smooth scrolling: it’s easier to understand what is happening when movement accompanies the change¹. Rather than scrolling (or focus change) being an instant jump, movement guides you to the new location.
After this exploration we had a good idea of what a good focus state needed. It needs to have a high contrast but not impair readability of the underlying components. It has to guide the user to the next focus target with a form of transition. And it only needs to show for users benefitting from the focus outline.
I can imagine it being an accessibility win since, while the page will scroll to make sure the next focused element is visible, it doesn’t otherwise help you see where that focus has gone. Movement that directs attention toward the next focused element may help make it more clear.
I can imagine it being harmful to accessibility in that it is motion that isn’t usually there and could be surprising and possibly offputting.
If it “just works” on all my focusable elements, that’s cool, but I see there are data attributes for controlling the behavior. If I find myself needing to sprinkle behavior control all over my templates to accommodate this specific library, I’d probably be less into it.
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