at-rule
There are 3 repositories under at-rule topic.
ryanmorr/is-at-rule-supported
Feature test support for CSS at-rules
soluml/at-rule-packer
Merge media queries (@media), @supports, and other duplicate At-rules together under a single block.
songsterr/postcss-remove-all-at-rules
PostCSS plugin to remove all of the at-rules