More Accurate Device Pixel Ratio Function

[skibulk]

Is window.devicePixelRatio always accurate? I found this code which seems to indicate that there may be special cases to be handled.

https://github.com/tysonmatanich/GetDevicePixelRatio/blob/master/getDevicePixelRatio.js

[onassar]

I can confirm this doesn't work on Safari 12.x