Yeah we have indeed started. First thing by improving the WPT tests, which lead to find 2 interop issues between Chromium and Firefox. Then while importing the tests in WebKit, found an old bug related to “focus” event and :focus pseudo-class, which has been fixed now.

See: https://opencollective.com/open-prioritization/projects/focus-visible-in-webkit