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E.g. http://jigsaw.w3.org/css-validator/validator?text=a{font-family:Verdana} &output=soap12 returns <m:warningcount>1</m:warningcount> <m:warninglist> <m:warning> <m:line>0</m:line> <m:level>0</m:level> </m:warning> </m:warninglist> </m:warnings> which ain't very useful. A probably related issue, e.g. http://jigsaw.w3.org/css-validator/validator? uri=http://msdn.microsoft.com&output=soap12 returns <m:warnings> <m:warningcount>17</m:warningcount> <m:warninglist> <m:warning> <m:line>0</m:line> <m:level>0</m:level> </m:warning> </m:warninglist> <m:warninglist> </m:warninglist> </m:warnings> which seems contradictory.
Fixed, see http://qa-dev.w3.org:8001/css-validator/