People who have heard about HTML 3.0 should notice that HTML 3.2 is not an extension or a variant of it. (The version numbers 3.0 and 3.2 are misleading!) HTML 3.0 which was a draft which expired 1995, mainly due to major browser vendors' unwillingness to implement it, though vendors claimed conformance to it long thereafter!
More exactly, HTML 3.2 contains
For a good summary of the new features in HTML 3.2 as compared with HTML 2.0, consult the article What's New in HTML 3.2 in the World Wide Web Journal, but please notice that it contains a few mistakes.