We developers are so gullible. Just give us some shiny things and we don't even realize they're heating up the pan.
Nested CSS is supported in the latest version of all major browsers.
The center row of versions with the gold border is how caniuse indicates the current release.
I hovered over the green box for Firefox 117 and it said “Released”. I see now that for browser versions that have actually been released, it says “Released <release date>” and it’s just a very misleading bug because all unreleased browser versions will just say “Released”.