User guide
SCSS is a superset of CSS that adds variables, nesting, mixins and functions. Compilation turns it into standard CSS that browsers understand. Here, compilation runs locally — nothing is sent to a server.
FAQ
Is my data sent to a server?
No. Compilation runs entirely in your browser; your code never leaves your machine.
Which SCSS features are supported?
Variables, nesting, mixins, functions, operations and the usual color functions via the embedded LibSass engine.