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From http://jigsaw.w3.org/css-validator/BUGS.html H1 { elevation: 50rad; } Here I have an error and a bug. In first, angle are always convert in degree, and in this case, it should be not. In second, the validator said 50rad == 50deg, so this is a big bug.
Fixed, see http://qa-dev.w3.org:8001/css-validator/