Looks nice, and I'm glad they put some effort to fit into the current properties and capabilities. It felt like in past, examples such as adding CSS grid syntax was really different/idiosyncratic for unclear reasons.
I kinda feel like CSS is already feature complete. I know they listed things that can't easily be done currently but I'm not upset about that.
I mean, this is just this <a href="https://xkcd.com/927/" rel="nofollow">https://xkcd.com/927/</a> actually happening.<p>Clearly, the answer is more standards!