HTML attributes : What are the interesting things that can be done using them? [closed]

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What are the interesting things that can be done using HTML attributes?

(apart from their original intended purpose, duh)

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Interesting things? Well, I guess they can be used for controversial political commentary:

<div id="countries">
  <div id="united_states" class="totally_broke">United States</div>
  <div id="china" class="winning">China</div>
</div>

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Have a look at this page, has a lot of informative new specified attributes, namely on ANCHORS and VIDEO/AUDIO, also form elements

http://simon.html5.org/html-elements