Recently, It's re-occurred to me that the vast majority of websites that implement forms for whatever functionality - do NOT follow best practice rules.

Sure it's easy to forget an element here and there but doing so, can degrade the user experience some what.

webmonkey.com reports that W3C have droped support for audio and video codec requirements. 

 "The stewards of the web have removed the sections of the HTML 5 draft specification that would recommend web browsers support audio and video playback using a specific codec."

If you haven't seen smashingmagazine.com then I recommend you visit them now! They often post wonderful, useful techniques that are invaluable to web developers.