Indicate that something has regressed from Baseline

[knowler]

This PR I authored technically causes content-visibility to downgrade to Limited Availability from Newly Available, since it’s clear upon testing that Safari’s implementation of content-visibility: auto is only partial (see WebKit Bug 283846 — it doesn’t fully implement to spec and can create a significant issue for sites that use it unknowingly). I’m wondering if there could be a way to highlight regressions like these future reports (and/or make a change to the most recent report) as I think that’s pretty pertinent information to whoever is consuming the reports. Obviously a situation like this isn’t ideal, but I think it’s worth handling.

[bkardell]

Hmm interesting. What did you have in mind? (Sorry for the delay)