It’s SVG for iPhone web apps

Just a quickie. If you’re wondering how to create icons (or other graphics) that look decent on both the standard iPhone display and the fancy-schmancy Retina display – don’t create multiple copies – just use SVG. Get a copy of Adobe Illustrator. Export to SVG. Job done.

(In Mobile Safari SVG can be used both in <img> tags and as CSS background images. Check out the background-size property too.)