Add CSS version to CSS features

[M-J-Robbins]

More a question than an issue, or direct feature request.

With the new updates to the CSS spec (going back to version numbers, CSS4, CSS5 etc,). Would it be useful to add mark CSS features with the CSS version they belong to?

Here is a breakdown of features in each version
https://github.com/orgs/CSS-Next/projects/1/views/2
Good video going over the reasons for the change
https://www.youtube.com/watch?v=j4mOm1qic7k

Would it be useful to users to know that an email client supports some CSS4 features? or is this kind of grouping not really relevant to email as support is so mixed. Should stay focused on the individual element.

[o-t-w]

I think this was a weird decision from the CSSWG tbh. New CSS specs are written up all the time, a CSS feature will land in one browser and then years later it might land in another browser. The grouping is basically arbitrary and unhelpful.