Margin Collapse in CSS
Andy Budd (who apparently lives in Brighton, which is where my mate Ben lives...) brings us an excellent essay about margin collapse in :CSS:. This is a phenomenon that I knew existed and knew a little bit about it, but this article does a really great job of explaining it in simple terms without getting all “techy”. (Well, as non-techy as you can get when talking about CSS, at least. 
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