Pseudo elements are visible elements on a web page that aren't "in the DOM" or created from HTML, but are instead inserted directly from CSS. This allows you to do lots of neat design-y things without cluttering the markup. Pseudo elements are CSS 2, so browser support for them is pretty good!
Links from Video:
Nicolas Gallagher: interview, multiple backgrounds, icons
Meet the Pseudo Class Selectors
Matt Hamm: page curl
CSS Triangle
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