window.devicePixelRatio

Peter-Paul Koch:

It pleases me to inform you that most browsers implement window.devicePixelRatio correctly. The property contains the ratio between physical pixels and dips, and even though some values appear strange at first, they actually make sense.

Super-useful for delivering retina-caliber web designs conditionally. Don’t miss his follow-up, either.

★ Friday, 6 July 2012