When designing documents that use media queries, the same media query may be used in multiple places, such as to qualify multiple @import statements. Repeating the same media query multiple times is an editing hazard; an author making a change must edit every copy in the same way, or suffer from difficult-to-find bugs in their CSS.
(From https://drafts.csswg.org/mediaqueries-5/#custom-mq)
This is currently supported by Lightning CSS.
When designing documents that use media queries, the same media query may be used in multiple places, such as to qualify multiple @import statements. Repeating the same media query multiple times is an editing hazard; an author making a change must edit every copy in the same way, or suffer from difficult-to-find bugs in their CSS.
(From https://drafts.csswg.org/mediaqueries-5/#custom-mq)
This is currently supported by Lightning CSS.