Googling "html tags explained" lead me to This page, which is a basic html tutorial with some extra info, then I clicked on the entry on the left side of the page called "HTML Tables" scrolled down a bit and found what <tr> <td> and <th> stand for.
I believe colored cells are implemented, and I know you can bold text in tables.

IMO pronuncation sections wouldn't be the best idea, but a spot to put a line like "Here's a description of the language's phonology" and you can paste in the appropriate link to your page with that info wouldn't be too bad of an idea.