W3C validator does not support nested CSS (2026-07)

By Xah Lee. Date: 2026-07-11. Last updated: 2026-09-10.

2026-07-11

The w3c validator does not support nested css

amazing. the w3c css validator still no do nested css syntax.

w3c validator nested css 2026-07-10 ll — w3c validator nested css 2026-07-10

https://x.com/xah_lee/status/2075741201320550741