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

A summarize of current behavior:

Chrome & Firefox:
**DSF**(device scale factor) affect **screenX/Y**, **clientX/Y** and **devicePixelRatio**,
**page zoom**(eg. ctrl+/-) affect **clientX/Y** and **devicePixelRatio**, does NOT affect **screenX/Y**.
(clientX/Y are in css pixel, screenX/Y are not)
Firefox proposed a change in devicePixelRatio should not be affected by page zoom, and decided not to keep current behavior.

Edge:
**DSF** & **page zoom** both affect **clientX/Y**, and **devicePixelRatio**, NOT affect **screenX/Y**
(clientX/Y are in css pixel, screenX/Y are in physical pixel)





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