To the best of my knowledge 2.3.4, similar to 2.2 would be considered an A-grade browser. I don't personally test with Android so I'm only going off on what we have in our docs, but technically all of the jQuery API should work fine there without issue. You might run into the odd Android-quirk, but I doubt a complete list of supported API features would be made available easily. Might be more realistic to request a list of the tickets in the tracker specific to this version of Android.