PUBLIC MARKS with tags retina & javascript

Conditionizr is a fast and lightweight (3KB) javascript utility that detects browser vendor - touch features and retina displays - allowing you to serve conditional JavaScript and CSS files.

When your users load a page, retina.js checks each image on the page to see if there is a high-resolution version of that image on your server. If a high-resolution variant exists, the script will swap in that image in-place. The script assumes you use Apple's prescribed high-resolution modifier (@2x) to denote high-resolution image variants on your server.