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The validator does not report errors for a { border: thin dashed 1pt white; } and produces an odd valid style sheet. See http://jigsaw.w3.org/css-validator/validator?text=a+%7B%0D%0A++border% 3A+thin+dashed+1pt+white%3B%0D%0A%7D&warning=1&profile=css2&usermedium=all And see http://www.w3.org/mid/3F07179D.5080308@gmx.net for details.
See also http://www.w3.org/mid/4050A801.3070807@mezzoblue.com
Created attachment 375 [details] 'Border' declarations with extra term The extra term for each declaration is a <border-color>, <border-style>, or <border-width>. Each declaration has 4 terms.
A non-null "usermedium" query parameter is required to produce the faulty parsing. Contrast: <http://jigsaw.w3.org/css-validator/validator?text=a%7Bborder%3A1pt+1pt+none+red%7D&usermedium=all> (which accepts the invalid style sheet) ...versus... <http://jigsaw.w3.org/css-validator/validator?text=a%7Bborder%3A1pt+1pt+none+red%7D> (which raises an error about the style sheet).
Fixed in today's patch, online version will be up soon at http://qa-dev.w3.org:8001/css-validator/