My personal approach...use feature detection for the first pass. User Agents for the cases where it doesn't work. And by the way, it doesn't always work, and

My personal approach...use feature detection for the first pass. User Agents for the cases where it doesn't work. And by the way, it doesn't always work, and some "features" cannot be detected. I've spent a lot of time optimizing pages for video. Some browsers work just fine, some work but look like crap, so you use a flash/silverlight plugin, then a new version comes out and looks less crappy. I also have a lot of code I turn off just for IE7...the code works, but doesn't render properly. There is no way to detect "renders ugly" So, "YES", feature detection is the future...but it isn't quite there yet (about 98%).