Normalize keyword values for position into length values.

Use the :focus-visible pseudo-selector in CSS

Minify at-rule params with PostCSS

Use the ic length unit

Merge longhand properties into shorthand with PostCSS.

Ensure CSS selectors are unique.

PostCSS plugin to transform percentage-based opacity values to more compatible floating-point values.

Use 4 & 8 character hex color notation in CSS

Use a place-* shorthand for align-* and justify-* in CSS

Nest rules inside each other in CSS

Discard duplicate rules in your CSS files with PostCSS.

Use Custom Selectors in CSS

Use the rebeccapurple color keyword in CSS

PostCSS plugin to transform :not() W3C CSS level 4 pseudo class to :not() CSS level 3 selectors

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

Discard comments in your CSS files with PostCSS.

Use logical properties and values in CSS

Use the :any-link pseudo-class in CSS

PostCSS plugin to transform clamp() to combination of min/max

Use the gap, column-gap, and row-gap shorthand properties in CSS