Finally one will be able to play the embeddded audio files that are on wiki pages on sone platforms/software. MP3 is far better supported everywhere than OGG.
Doesn’t work on iOS, even though the official ogv.js demo works.
Adding on to this: iOS doesn't play mp3 for mp4 containers either. Encoding media to play on an iDevice means resorting to AAC, which doesn't have as good licensed codecs.