Device.js makes it easy to write conditional CSS _and/or_ JavaScript based on device operating system
http://matthewhudson.me/projects/device.js/
JavaScript Libraries and Functions · Compatibility
Get access to data on 266,287 websites that are Device JS Customers. We know of 76,651 live websites using Device JS and an additional 189,636 sites that used Device JS historically and 33,038 websites in the United States.
Get a list of 266,287 websites using Device JS which includes location information, hosting data, contact details, 76,651 currently live websites and an additional 50,114 domains that redirect to sites in this list. 189,636 sites that used this technology previously and 33,038 websites in the United States currently using Device JS.