SCSS is a CSS preprocessor that adds many features like variables, mixins, imports, color manipulation, functions, and tons of other powerful features. The entire compiler comes in a single class file ready for including in any kind of project in addition to a command line tool for running the compiler from the terminal. scssphp implements SCSS (3.1.20). It does not implement the SASS syntax, only the SCSS syntax. If you are wondering what SASS is :

SASS is an extension of CSS3, adding nested rules, variables, mixins, selector inheritance, and more. It’s translated to well-formatted, standard CSS using the command line tool or a web-framework plugin.

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The question is, should CSS3, SASS’s work be done by web designers or by programmers ?!