[w3c/uievents] MouseEvent.screenX/Y coordinate space id not clear (#150)

@garykac @RByers @dtapuska @eirage

It is not very clear what the coordinate space of screenX/Y attributes is.
Is that the correct that is it in css pixels? In other words if screenX/Y of the events is increased by 1 does that mean it has moved 1 css px? So if I have a full screen browser and I set the left/top of a div to the screenX/Y of events should it follow the mouse pointer (as in [this example](http://output.jsbin.com/mesodifoxo))?

Note that I don't care about the offset as you can move the browser window in the screen. I care about the scale of each pixel.

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