Aside/Rant: I also get the impression that frontend devs have never read the CSS2.1 spec or bothered to understand it (CSS3 is longer, and consists largely of special-purpose extra modules, so a complete reading is less valuable and more difficult). There's somehow this feeling that since CSS "isn't a real programming language" you should be able to use it intuitively. And when things don't work out and you fiddle until it works without giving thought to why, that's OK. That's such a huge waste of time. The box model may not be 100% intuitive, but boy, if that's your standard, what you doing in IT?