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+++ This bug was initially created as a clone of Bug #16185 +++ Transform (mind the prefixes) is serialized as "rotate(100grad)" in every browser except Opera, which serializes it as "rotate(90deg)". The spec seems to support Opera, but I suspect that's just an error, maybe dating back to a time when deg was the only angle unit. Angles should serialize like lengths, as the appropriate <number> followed by the unit in canonical form.
https://dvcs.w3.org/hg/csswg/rev/8ce968245d89