scottjehl/picturefill — pull request #39 by wturrell (2012-08-12 18:40:15+00:00)
Title: Added note on requirement for browser prefixes for HD images

`min-device-pixel-ratio` alone isn't enough for the iPhone/iPad (in iOS 5.1). I've added a note but left the prefix-less code sample as it is to avoid the compound stuff with the widths becoming too confusing.