bugs in css validator?

ok, i have noticed a few quirks in the css validator service that i was
just curious about.

firstly, if i point it at a site i am making:

http://www.americanvision.net

it tells me that there is an html error, however, this document passes
the html validator as XHTML strict...plus i dont even see any code on
the line it is complaining about:


the error is:

---------------------------------------
Target: http://www.americanvision.net

Please, validate your XML document first!

Line 167

Column 27

Element type "td" must be followed by either attribute specifications,
">" or "/>". 
---------------------------------------

anyway, if i point it to any other page in the site this goes away but
then i noticed somthing else strange..it seems to give a parse error on
any selectors that have an underscore in them... for example:

# Line: 49 Context : #img
Parse Error - #img_bfill { position: absolute; left: 0px; top: 0px; } 

now, this isn't a huge deal because all browsers that i have tested on
have no issue with such selectors, but it is nice to know i'm up to
spec.

to be honest, i'm not sure if the spec says you can't use underscores,
and that would strike me as odd anyway.

i'm curious to find out :)

Evan Teran