[joesb]

Why are people assuming that they don't use feature detection just because they have a warning based on UA-sniffing?

Saying that an unknown browser is "unsupported browser" is not the same as saying that "it will break. we will deliberately disable the feature". All it means is "We don't know what this browser is. We have never tested on it. we will not pay as much attention is this unknown browser break".

Just because a browser passes features detection doesn't mean they don't have bugs or weird behaviors.

Why do people assume that Google doesn't both, using feature detection to enable features and also display warning if the user is user some browser they don't know and can't guarantee that they ever test on it.