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Feel free to put it through W3 validator, it is perfectly valid HTML5 (but the same can be done with 4 too).

This is not a valid document according to http://validator.w3.org/.

I suggest you run it through and see for yourself.

As a design/technology exercise, this is interesting, but it is not usable in any real-world application.

Validator is having hiccups ATM. It is valid, trust me. Try later. If you don't believe me, try some other pages, including the W3 one itself, they all come out as invalid.

Edit: The validator works now.

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