Reduce initial definitions to the actual initial value, where possible.

Correctly declare progressive enhancements for CSS Custom Properties.

Use the :any-link pseudo-class in CSS

Use flow-relative (inline-start and inline-end) values for float and clear

Use the relative color syntax in CSS

Parse CSS color values

Use Custom Properties Queries in CSS

SCSS parser for PostCSS

Convert modern CSS into something browsers understand

Use text-decoration in it's shorthand form in CSS

Use the :dir pseudo-class in CSS

Use two values display syntax for inner and outer display types.

PostCSS plugin to fallback initial keyword.

Minify gradient parameters with PostCSS.

Use logical overscroll behavior properties and values in CSS

Use the color-mix function in CSS

Use logical values in the resize property

Use light and dark color schemes in all browsers

Use vb and vi length units in CSS

Use the :focus-within pseudo-selector in CSS