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bubbles and cancelable are false by default when event is created, and it would make the spec easier to understand if that was the case in the dictionary too. Also, in Gecko it simplifies the implementation if we have default values.
I don't see the point given document.createEvent(). Maybe for events that cannot be instantiated via that method?
Context: http://krijnhoetmer.nl/irc-logs/whatwg/20130222#l-344 https://github.com/whatwg/dom/commit/508b3d58eb9df5250cc42cefa71062945c154ef0