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I used the list at
http://www.w3.org/TR/html4/index/elements.html to check
whether the right functions were used:

col, frame, input and param should have do_tag() methods
instead of start/end_tag(): they are empty tags in HTML 4.01.

dd, dt and li should use start/end_tag() instead of
do_tag(). They have an optional end tag in HTML 4.01.

Oh, and I couldn't find a method for the 'div' element!