accessibility, focus event listener

What do you think about adding focus event listener for non-mouse users? I'm undecided myself if this is a good idea but I was thinking of ways to make this accessible. The problem with a focus listener is that a user tabbing through items on the page would trigger everything as they navigate with the keyboard.

Thoughts? Concerns?

Great idea by the way!

Start by tracing the existing mouse-event perimeter behavior in the repository and compare it with keyboard focus navigation. The issue does not name files or tests; first establish the intended focus behavior and acceptance criteria, including whether tabbing should trigger perimeter responses without causing unwanted effects.

Written by the indexing model from the issue text.