Thank you for reading and commenting, Jawed! I’m thrilled to hear you found it useful. 🙂

Thanks so much for the heads-up, Matteo. 🙏 It seems that the implementation of calc-size() has changed and it now only supports two-argument form. So this at-supports rule works correctly: calc-size(auto) no longer works. I'm updating the article now to reflect this change. All calc-size(auto) examples must now be calc-size(auto, size).