rounddecimal numbers with custom precision, set decimal places, using
elseconditions, ternary operators, places that you can use conditionals
@contentdirective, pre-built selectors, placeholders pseudo element, media query mixins
&, useful for BEM fans
CSS PRE is a project that aims to collect as much information about the popular CSS Preprocessors as possible, in order to serve as a one-stop reference.
It is a collaborative project, edits on GitHub are welcome.