This is an archived snapshot of W3C's public bugzilla bug tracker, decommissioned in April 2019. Please see the home page for more details.
The entry page of the CSS Validator does not give any prominent notice that the service provided has bugs and problems and must not be used as a definitive reference for how a fully compliant(!) CSS parser will handle a given stylesheet. Due to the "definitive reference" character of publications of the W3C as the originating source of the CSS2 specification for most people, including CSS authors and especially implementers, I consider it quite dangerous to create the impression that the service provided can be used as a reference for one own's endeavours. I hereby strongly suggest to add a prominent link to the "Known Issues" list of the validator at the main entry page (and not bury it at the page's bottom in a small link without descriptive label) and add a warning notice that the validator may contain bugs and may not behave exactly as the specification requests.
Make the warning short, blunt, and clear: This validator has many bugs. Not for production use. Style it to make it prominent.
http://jigsaw.w3.org/css-validator/about.html#reference is enough, IMHO. No need to load the homepage with this.