It does not appear that the audio or video controls can be operated using the keyboard unless VoiceOver is enabled. test files: http://thepaciellogroup.github.io/AT-browser-tests/test-files/audio.html http://thepaciellogroup.github.io/AT-browser-tests/test-files/video.html related data http://terrillthompson.com/blog/635
<rdar://problem/21381170>
Can confirm that this is the case in Safari Version 8.0.6 (10600.6.3) on OS X Yosemite 10.10.3.
Dupe of bug 117857 *** This bug has been marked as a duplicate of bug 117857 ***