HTML5

Question

What tags are NOT supported by html5?
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Answer 1

What do you mean exactly ? And please include relevant tags in your post, like html5 and html, so people can find your question when they search
EDIT:
sorry I just read your question coreectly, I thought it was 'why' instead of 'what', which confused me.
and please post the answer you got here

Answer 2

Maybe this helps:

http://www.html-5.com/changes/deprecated/
http://www.techfreakstuff.com/2010/03/old-html-tags-not-supported-html5.html