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summary
A project called CSSNext provides a spec and PostCSS plugin set that compiles upcoming CSS features into today browsers, with version 1.0 released and a 0.5 milestone earlier; implemented capabilities listed include custom properties, selector enhancements like :matches, nesting, and the color() function for lightness/alpha/saturation tweaks, mentions variables already in Firefox and custom media appearing in IE, and notes integration with many plugins and PreCSS 5 so the feature set is demonstrably usable.
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