To add to this, one of suggestions in the article was to drop the doctype. While that puts the browser in tag soup parsing mode rather than html5, in practice b

To add to this, one of suggestions in the article was to drop the doctype. While that puts the browser in tag soup parsing mode rather than html5, in practice browsers don't actually start diverging much in behavior until you get to truly messed up markup, like malformed tags. So even the more egregious suggestions here are probably still fine, provided that you have equally egregious CSS hacks to get around ancient box model quirks