Normalize URLs with PostCSS

Normalize unicode-range descriptors, and can convert to wildcard ranges.

Convert two value syntax for repeat-style into one value.

Reduce transform functions with PostCSS.

SCSS parser for PostCSS

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

Use the :focus-within pseudo-selector in CSS

Normalize CSS animation/transition timing functions.

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

Merge longhand properties into shorthand with PostCSS.

Ensure CSS selectors are unique.

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

Trim whitespace inside and around CSS rules & declarations.

Use unquoted format on @font-face CSS definitions.

Use the :focus-visible pseudo-selector in CSS

Use Custom Selectors in CSS

Use 4 & 8 character hex color notation in CSS

Use the rebeccapurple color keyword in CSS

Use the ic length unit

Use the overflow shorthand in CSS