Re: [w3c/pointerlock] movementX/Y when zoom in/out (#23)

Thanks for the reply.  Firefox may need to change their implement to match the spec.

But for the DPI change, the screenX/Y actually will change with device scale factor.  If movementXSum should be the same nomatter DPI, it should use system coordinate instead of screen X/Y.  
Besides,  I believe macOs's hidpi are different from other platform.  When changeing the system scale in macos, the current movementXsum in your test page will change. 

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