PostCSS is a tool for transforming CSS with JS plugins. These plugins can support variables and mixins, transpile future CSS syntax, inline images, and more.
PostCSS is a tool in the Templating Languages & Extensions category of a tech stack.
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What are some alternatives to PostCSS?
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.
It is a bunch of cool, fun, and cross-browser animations for you to use in your projects. Great for emphasis, home pages, sliders, and general just-add-water-awesomeness.
Less is a CSS pre-processor, meaning that it extends the CSS language, adding features that allow variables, mixins, functions and many other techniques that allow you to make CSS that is more maintainable, themable and extendable.
It is a CSS post processor. It combs through compiled CSS files to add or remove vendor prefixes like -webkit and -moz after checking the code.
Jetpack, React.js Boilerplate, tachyons, JSFiddle, Basscss and 7 more are some of the popular tools that integrate with PostCSS. Here's a list of all 12 tools that integrate with PostCSS.