A tool set for working with with CSS including fast detailed parser, walker, generator and lexer based on knowledge of W3C specs and browser implementations

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  🚀 VSCode CSSTree validator v1.2 Now powered by CSSTree 3.0, featuring enhanced warnings for unknown properties, descriptors, and at-rules. Improved error highlighting makes catching CSS issues easier than ever.

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  🚀 CSSTree validator v4.0 Now powered by the latest CSSTree 3.0, featuring enhanced support for modern CSS syntax. Check it out!

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  🚀 CSSTree 3.0 is here! Featuring support for modern at-rules, improvements to query-related at-rules, spec alignments, other enhancements and bug fixes, and more. Release notes:

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  🚀 CSSTree 2.3.0 CSS Nesting support, units introspection and customisation, up to date mdn/data dictionary

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  Looks like CSSTree's definition syntax matching with an appropriate dictionary could be used for SVG attribute validation: