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UI Events is still under development and will be valid in the future? https://dvcs.w3.org/hg/d4e/raw-file/tip/source_respec.htm I ask because I see a lot of text which simply repeats D3E and D3E_code. Or maybe you plain moved all to the current version D3E specs?
The old UI events spec (which was rather tiny) has been set aside and the previous DOM3 events spec was renamed to UI Events. We did this because UI Events is a more appropriate name and we wanted to avoid (long-term) confusion. We'll be merging some of the old UI Events stuff back into the new UI Events as appropriate. The current UI Events (formerly DOM3 Events) ss at: https://w3c.github.io/uievents/