A mature CSS extension language with variables, nesting and mixins.
Quick facts
What is Sass
A mature CSS extension language with variables, nesting and mixins.
GitHub Linguist classifies Sass as a markup language, typically using extensions such as .sass.
File extensions:
Related extensions
Related languages
Frequently asked questions
A mature CSS extension language with variables, nesting and mixins.
Common extensions include .sass.
Sources & standards
Updated 2026-08-18
Explore this reference