PostCSS

Invalid custom media  

Reports a syntax error in a PostCSS Custom Media query.

Invalid custom selector  

Reports a syntax error in PostCSS Custom Selector.

Invalid media query range  

Checks range context syntax, which may alternatively be used for media features with a 'range' type.

Invalid nested rule  

Reports a nested style rule whose syntax doesn't comply with the PostCSS Nested or the PostCSS Nesting specification.

Unresolved CSS module value  

Reports an unresolved reference to a CSS Module Value (@value declaration).