W3C validator does not support nested CSS (2026-07)
w3c validator nested css
amazing. the w3c css validator still no do nested css syntax.
HTML standards
HTML validation
- HTML Correctness and Validators (2008)
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- HTML 5 Doctype, Validation, X-UA-Compatible, and Why Do I Hate Hackers (2011)
- Computer Language Spec Docs with Invalid HTML (2015)
- W3C validator does not support nested CSS (2026-07)