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the hsl color syntax described in the css3-color module are not yet supported by the CSS validator.
Fixed (need to produce positive and negative tests for that). See http://qa-dev.w3.org:8001/css-validator/ Also, need to fix the definition of background-color to allow such colors.
background-color and background fixed as well wrt css3-color values (rgba, hsl, hsla)
tests added, closing.