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In D3E mousemove event is cancelable, in D2E wasn't: http://www.w3.org/TR/2000/REC-DOM-Level-2-Events-20001113/events.html#Events-Event-initMouseEvent It would be helpful to mark these change in table for this event or some note box below table. Firefox still doesn't allow cancelable.
Now fixed in latest editor's draft. Changelist: https://dvcs.w3.org/hg/dom3events/rev/701bfcbb5d05