1) Try and write it in a similar style to the rest of the wiki. We've had a few pages that didn't fit in at all recently.
2) Don't make the page about all of HTML. It'll just be awkward and the page will be un-necessarily long. Rather, make it an introduction to HTML, outlining the basics. Leave the complex stuff until later - we can add separate pages for the advanced coding.
3) Put it in the damn HTML category. We have enough category trouble already.
4) Seriously, don't make it complex. This wiki's kind of a mess already and we're only dealing with WML.