Re: [touch-events] TouchInit should perhaps include pageX and pageY (#28)

I think UI Events is quite broken when it comes to `MouseEvent` (UI Events is better not used as a guidance for defining events):

1. It should include the missing members.
2. Although it should not change `initMouseEvent()` arguments, it should define the method fully. Not through a note.
3. The missing members should be included in the `MouseEventInit` dictionary.

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https://github.com/w3c/touch-events/issues/28#issuecomment-130202996