Inline data in CSS marked as invalid?

Hello guy

Sorry but something seems to be wrong with the CSS 2.1 Validator.

The inline data is marked as invalid. But it's done properly regarding 
the CSS specification. For background images I am using 
url(data:image/png;base64,iVBORw0KGgoA... to reduce the number of requests.

But the validator says following:
- Value Error : background 
<http://www.w3.org/TR/REC-CSS2/colors.html#propdef-background> attempt 
to find a semi-colon before the property name. add it
- Value Error : background 
<http://www.w3.org/TR/REC-CSS2/colors.html#propdef-background> Parse 
Error null
- Property data doesn't exist : image/png

Can you confirm me if this is a bug or not?

Cheers

Michael

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