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 249,825 websites that are Device JS Customers. We know of 84,872 live websites using Device JS and an additional 164,953 sites that used Device JS historically and 37,353 websites in the United States.
Get a list of 249,825 websites using Device JS which includes location information, hosting data, contact details, 84,872 currently live websites and an additional 65,712 domains that redirect to sites in this list. 164,953 sites that used this technology previously and 37,353 websites in the United States currently using Device JS.