I want to have a "crisp" cursor (its pixels should correspond to hardware pixels).
My devicePixelRatio is 1.25 (set in the OS, browser zoom is 100%).

url(crosshair.png) 50 50, auto;

-webkit-image-set( url(crosshair.png) 1.25x ) 40 40, auto;

url(crosshair.svg) 50 50, auto;