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

I'm not an expert here but according to https://drafts.csswg.org/cssom-view/#dom-mouseevent-screenx, it seems that this should be in CSS pixels (since "Web-exposed Screen Area" is defined in CSS Pixels) though that's still an ED. That seems to match both Firefox and Chrome's implementations. In general, all coordinates I know of in the browser are in CSS pixels. Though for screenXY it does seem a bit awkward as the rest of the screen doesn't have browser zoom applied to it... 

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