W3C validator

so i have my html 5 page at the moment all sorted out so it validates. Made the correct error changes and it all comes up green. Sweet. But I know validate the CSS3 and all the CSS3 is coming up as errors. Whats the best thing to do. It all works on my browsers FF GC Safari. but stuff like psuedo is coming up as errors.
The css3 cant be wrong surely. Is it the validator has not been updated so CSS3 is compliant.

I have been a html css website dev for around a year and starting to do freelance work and its important for me to understand everything i can.

If anyone could answer my problem I would be much appreciated. thanks.

You haven’t shown us any code so I can just guess but I suppose what comes up as errors are the non-standard vendor prefix properties like -moz-box-shadow or background: -webkit-linear-gradient(…). These are experimental properties for preliminary testing only and should normally not be used in production environments (besides many impatient developers still doing so), and are therefore not a valid standard — neither is CSS 3, yet, by the way.

yeah thats its. That clears it up. Thanks alot. i used an "experimental css3 slider " that uses fancy stuff.
Thanks for that clarifies stuff up.

I used box shadows, psuedo code and webkit properties.

nothing major i just wanted to know if it was me, but its all good.