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They don't seem to have those right now, but I think they might need them for web compat. So does cssFloat. Gecko certainly has such annotations. Also, shouldn't the dashed property case be specified as a partial interface similar to the normal case?
https://dvcs.w3.org/hg/csswg/rev/26672b51dc80 (I think I had considered this and concluded that it was fine because setProperty's argument has [TreatNullAs]. However it's not fine without having a nullable type for the camel-cased/dashed attributes. But I've used [TreatNullAs] to avoid confusion.)
Thanks!