UserAgent sniffing and Graceful Degradation do not mesh. This sniffing in particular will fail for Opera 6-8, therefore excluding perfectly capable browsers by

UserAgent sniffing and Graceful Degradation do not mesh. This sniffing in particular will fail for Opera 6-8, therefore excluding perfectly capable browsers by a very shallow criterion. The sniff serves no purpose, and is furthermore based upon a thoroughly disproved anti-pattern.