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"Why do we need a sanctioned header and footer and time tag? Why wouldn't you just make tag names open ended and control the presentation with CSS?"

I feel the same way. Tags have always been, until recently, only added when a new behavior was to be implemented (ex: canvas, video, etc).

I think this change in focus from technical ability to semantic information really signals that we are solidly into the information age.

We have pretty much worked out how to get stuff done, it's time to start harnessing the results and start reporting on what is out there.

Classifying the information can only be a good thing.

> Tags have always been, until recently, only added when a new behavior was to be implemented (ex: canvas, video, etc).

Not really. <th> versus <td> comes to mind.