Feature detection is great, it's just that the conditional comments also prevent the file from being fetched in the first place.

Anyway, I think we should try to and do feature detection. It's just `opacity` and `hls/hlsa/rgba`, shouldn't be too hard. I don't know if we should wait with pulling the amd support until the IE plugin works standalone though to prevent people from having the same problems we're discussing here. Unfortunately I don't think I can work on this at least the next week, probably longer.