How to make your web page retina display compatible?

iphone4, the new ipad and new macbook all now has a retina display, how could your web page make sure of it? Someone has made a flow chart on how to turn different element/content of your web page to be retina display compatible.

It is an interesting process.

http://f.cl.ly/items/012n0O023v2S2N1m3Q1t/How%20to%20Retinafy%20your%20Website.pdf