Does Safari not support HTML 5?

[aaronvan]

Watching a video inside Safari and saw this. Video worked. Running Mavericks.

 

[besler3035]

It does, though I'm not sure if OS X supports .ogg files out of the box...

 

[antonis]

It does, though I'm not sure if OS X supports .ogg files out of the box...

This.

HTML 5 is one thing, but file formats is another and varies from browser to browser (e.g. Firefox will not play mp3 due to licensing issues of this format - at least not when using standard html code). FWIW Safari was one of the first (if not the first) browsers to successfully pass html 5 compatibility tests.