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-title: CSS Pre-Processors
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-## CSS Pre-Processors
-
-Pre-processor is a software that allows to use extended CSS functionality with variables, functions, operators and many more useful assets that plain CSS is missing.
-
-## Popular Pre-Processors
-
-* [SASS](http://sass-lang.com)
-* [LESS](http://lesscss.org)
-* [Stylus](http://stylus-lang.com)