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The following valid snippet causes the validator to complain of a Parse Error: .frozenY { box-shadow: 0px 2px 4px -2px #BBB; } Replace "-2px" with "2px" and there's still an error -- it's not the "-". Remove the "-2px" and there's no error. Therefore it's 4 lengths that are seen as illegal. The browser (Chrome, FF) renders the shadow as designed, and according to http://www.css3.info/preview/box-shadow/ this is valid CSS: box-shadow: none | <shadow> [ , <shadow> ]* <shadow> = inset? && [ <length>{2,4} && <color>? ]
fixed when box-shadow was re-implemented.