Re: [editing] Cancelable attribute should be removed from the spec because it already referenced in Event.idl (#100)

@gked I recognize this is still not entirely removed (which it should). However, currently the ui-events spec says that the event is cancelable, whereas the input-events spec says this about cancelability: "Varies: False for inputTypes insertCharacter and deleteComposedCharacter during IME composition. True otherwise"

The false in the mentioned cases was due to arguments from browser makers about it not being possible to stop the DOM modification when running in IME, as that may create problems for the IME. Is this something that you have discussed at the meeting in January and found a way to avoid (so that the beforeinput event always can be canceled)?

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