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Validating the CSS Color Module Level 3 http://dev.w3.org/csswg/css3-color/#svg-color flags three of the extended colors (cadetblue, darkgrey, powderblue) as errors: http://jigsaw.w3.org/css-validator/validator?uri=http%3A%2F%2Fdev.w3.org%2Fcsswg%2Fcss3-color%2F&profile=css3&usermedium=all&warning=1&vextwarning=&lang=en
Fixed (CSS3-colors support has been revamped, and this bug was solved by doing so)
See http://qa-dev.w3.org:8001/css-validator/ for a live instance