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W3C CSS Validator

Modern CSS validation in JS environments using W3C’s public API

Modern design

Modern design

Written entirely in TypeScript, with zero dependencies, and a promise-based design.

Node.js + browser

Node.js + browser

Switches intelligently between native libraries to work in both Node.js and browser environments.

Thoroughly tested

Thoroughly tested

An extensive suite of automated tests verifies every change to the codebase.