`level4` is a PostCSS plugin bundle that lets developers write CSS using upcoming W3C Level 4 features—custom properties, custom media queries, custom selectors, new color functions, nesting, and advanced pseudo‑classes—and have them compiled to today’s widely‑supported syntax. It’s aimed at front‑end engineers who want to experiment with future CSS specifications now without sacrificing browser compatibility.
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PostCSS plugin to transform W3C CSS color function to more compatible CSS.
Use 4 & 8 character hex color notation in CSS
PostCSS plugin to transform W3C CSS hwb() color to more compatible CSS (rgb() (or rgba()))
Use the rebeccapurple color keyword in CSS
Use Custom Media Queries in CSS
Use Custom Properties Queries in CSS
Use Custom Selectors in CSS
PostCSS plugin to transform W3C font-variant properties to more compatible CSS (font-feature-settings)
Using more intuitive `>=`, `<=`, `>`, `<` instead of media queries min/max prefix.
Nest rules inside each other in CSS
Use the :any-link pseudo-class in CSS
PostCSS plugin to transform :matches() W3C CSS pseudo class to more compatible CSS selectors
PostCSS plugin to transform :not() W3C CSS level 4 pseudo class to :not() CSS level 3 selectors
Formatted TAP output like Mocha's spec reporter
tap-producing test harness for node and browsers
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