I have yet to see a solution that provides acceptable levels of client data and accuracy that completely avoids parsing the User Agent string. Feature detectio

I have yet to see a solution that provides acceptable levels of client data and accuracy that completely avoids parsing the User Agent string. Feature detection alone won't cut it, and the converse is true as well. So for the time being, the most effective method to optimize your website for the widest variety of clients, is to employ both User Agent parsing (server side) and feature detection (client side).