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In CSS3 "transparent" is not an explicid keyword, but according to the specification is a valid color. In verifying using the CSS3 profile it is reported as an error: Invalid number : backgroundToo many values or values are not recognized : transparent Specs see: http://www.w3.org/TR/css3-background/#properties
http://jigsaw.w3.org/css-validator/validator?text=a%7Bcolor%3Atransparent%7D&warning=2&profile=css3&usermedium=all
Fixed, see http://qa-dev.w3.org:8001/css-validator/
I think we have a regression here. The bug is indeed fixed in the production instance of the validator, but the dev version complains about transparent is not a color value again.
Fixed by updating the CSS3 background properties to match the CSS21 ones, before implementing extra properties/values from css3-background, once it becomes stable.
Regression. As of 2009-02-05 http://qa-dev.w3.org:8001/css-validator/validator?text=a++%7B++++color+%3A+transparent%3B%7D&profile=css3 and http://qa-dev.w3.org:8001/css-validator/validator?text=a++%7B++++color+%3A+transparent%3B%7D&profile=css21 complain about "transparent is not a color value : transparent" http://jigsaw.w3.org/css-validator/validator?text=a++%7B++++color+%3A+transparent%3B%7D&profile=css3 is happily validating.
The situation is now the contrary of the situation in the last comment (comment #5). The bug appears with the production server: http://jigsaw.w3.org/css-validator/validator?text=a++%7B++++color+%3A+transparent%3B%7D&profile=css3 The bug has been fixed with the dev sevrer: http://qa-dev.w3.org:8001/css-validator/validator?text=a++%7B++++color+%3A+transparent%3B%7D&profile=css3
(In reply to comment #6) > The situation is now the contrary of the situation in the last comment (comment > #5). > > The bug appears with the production server: > http://jigsaw.w3.org/css-validator/validator?text=a++%7B++++color+%3A+transparent%3B%7D&profile=css3 > > The bug has been fixed with the dev sevrer: > http://qa-dev.w3.org:8001/css-validator/validator?text=a++%7B++++color+%3A+transparent%3B%7D&profile=css3 It seems the bug is closed. At least there's no error anymore in Production.