What is css preprocessing

css preprocessing refers to the processing of a certain syntax before generating CSS; the CSS preprocessor uses a special programming language to design the Web page style, and then compiles it into a normal CSS file for Project use.

The operating environment of this article: Windows7 system, HTML5&&CSS3 version, Dell G3 computer.

The Css preprocessor defines a new language that uses Css as a target to generate files, and then developers only need to use this language for coding work. Preprocessors can usually implement browser compatibility, variables, structures and other functions, making the code more concise and easier to maintain.

In layman’s terms, “The CSS preprocessor uses a specialized programming language to design Web page styles, and then compiles them into normal CSS files for project use. The CSS preprocessor adds some features to CSS Programming features, no need to consider browser compatibility issues"

CSS preprocessor technology has been very mature, and many different CSS preprocessor languages ​​have emerged, such as:

Sass（SCSS）
LESS
Stylus
Turbine
Swithch CSS
CSS Cacheer
DT CSS

So far, among the many excellent CSS preprocessor languages, Sass, LESS and Stylus are the best, with many discussions and comparisons.

【Recommended learning: css video tutorial】

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