What is required to get the embedded Ogg Vorbis/Theora media on Wikipedia to play back natively in Safari, assuming a clean, up-to-date OS X install?
The Wikipedia page for Beethoven's Piano Sonata No. 14 can be used as an example. In Chrome, this page renders the following infobox:
In Safari, this same excerpt renders as following:
Safari > Preferences... > Extensions
and look at the lefthand column. I'm asking because Safari should be able to play those files already - as long as you have iTunes installed. – humcat Feb 22 '15 at 19:57