markup style guide

I'm referencing the Drupal Markup Style Guide g.d.o wiki in the Definitive Guide to Drupal 7 and it hasn't been updated in a couple years so i wanted to give all interested parties, especially HTML5 folk, foreknowledge to update it (or link it to a d.o equivalent?).

Advice is sound and it's the most comprehensive take i've seen from a module developer's perspective, so that's why i'm providing the link: http://groups.drupal.org/node/6355

Discuss the Drupal Markup Style Guide

For reference, here is the discussion that has already occurred on that wiki page:

Bevan said:

I reworked this to add my two cents. I incorporated all previous ideas in this -- I think. Let me know if I missed something. - B/

Elv said:

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It's better to have too many classes than not enough