This looks like a very useful post by Jens Meiert on his Blog called “HTML: All elements from HTML 3.2 to XHTML 2.0”
He lists a continuously updated index of all elements defined by the HTML 3.2, HTML 4.01 (covering all document types), XHTML 1.0 Strict, XHTML 1.1, HTML 5, and XHTML 2.0 specifications and drafts
This page could be a really good addition to your toolbox. Have a look.