Hello there! The author of the article is here.

The main goal of this is to explore the potential of modern CSS in building such a layout. I agree that some of the features aren't supported yet, but that will become better over time. The article shed light on things like container queries, fluid sizing.. etc.

I think it would have been worthwhile mentioning browser support in quite a few places:

• Container queries have less than a year’s support in any browser;

• Style container queries have only an incomplete implementation in Chromium for a month;

• :has() isn’t in Firefox yet and has been in other browsers for a year at most.

That is: you can’t actually depend on these features yet.

Just want to say thank you. Great article and really enjoyed your other about flexbox vs. grid.