Comment by jsheard
Then again PDF also technically supports embedded audio, video, 3D graphics, and arbitrary Javascript. If Flash hadn't died it would probably still support that too. It's a clown car format where everyone besides Adobe just tacitly agrees to ignore huge chunks of the spec.
> It's a clown car format
As is the destiny of any document format in wide spread use, PDF had flash, doc had ActiveX.
Also this text is formatted using a mark down language fully capable of embedding entire applications.