Css, LESS and Sass

Here is the source article.

LESS and Sass share a lot of similarities in syntax, including the following:

• Mixins – Classes for classes.
• Parametric mixins – Classes to which you can pass parameters, like functions.
• Nested Rules – Classes within classes, which cut down on repetitive code.
• Operations – Math within CSS.
• Color functions – Edit your colors.
• Namespaces – Groups of styles that can be called by references.
• Scope – Make local changes to styles.
• JavaScript evaluation – JavaScript expressions evaluated in CSS.

 

LESS website: http://lesscss.org/

Sass website: http://sass-lang.com/