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The latest evolution of CSS is CSS4, right?
Is that quiz up to date? https://www.w3schools.com/w3css/w3css_versions.asp
W3.CSS is a CSS framework developed by w3schools, it is not the name of the CSS specification. And despite the (intentionally) misleading name w3schools has no connection whatsoever to the W3C standards group that develops HTML and CSS.
The latest official CSS specification is still CSS3, though that comes with the caveat that the way the CSS standard works has changed in such a way that it's unlikely we will ever see an official CSS4. If you are curious you can read a detailed article about that subject here.
David Moorhead18,005 Points
I'd like to add Jen Simmons' youtube presentation; Jen presents on behalf of Mozilla. The video is titled, "Where is CSS4?". The video was published June, 2018.
Noted in the video is W3C's working-group status for CSS Specifications. The page contains a list of all completed specifications and drafts by CSS WG, and there are numerous links to respective pages for specific definitions. As of this post, the W3C page was last updated Sunday, October 21, 2018.