CSS warnings

I was trying to validate my CSS file and kept getting warnings for 
background-color so I decided to try some CSS files on W3C even 
http://jigsaw.w3.org/css-validator/style/error.css  and 
http://www.w3.org/StyleSheets/home both W3C CSS files had 
background-color warnings however the only time the file registered as 
valid CSS files was when I just tested them from the serve uri and not 
uploading a copy that I just downloaded from the servers.

1.) Why are only valid CSS files found on servers?
my second question I will have to research more on my own but here is 
the question anyways:
2.) Why do the warnings 'background-color ' exist if a background-color 
element exist or dosn't exist in these cases?

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Received on Wednesday, 11 July 2001 04:59:15 UTC