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validator doesn't seem to recognise those values e.g. .foo { border-color: hsl(0%,0%,56%); } .foo { border-color: hsla(0%,0%,56%,1); } .foo { border-color: rgba(0%,0%,56%,1); }
The hsl and hsla values are wrong, .foo { border-color: hsl(0,0%,56%); } .foo { border-color: hsla(0,0%,56%,1); } .foo { border-color: rgba(0%,0%,56%,1); } are OK (note that the first value of hsl and hsla are not percentages)