Disallow missing punctuation for non-boolean media features.
@media (max-width: 600px) {}
/** ↑
* This punctuation */This rule ensures that there is either a colon or a range operator in non-boolean media features.
The following patterns are considered warnings:
@media (max-width 600px) {}@media (width 20em) {}The following patterns are not considered warnings:
@media (max-width: 600px) {}@media (width >= 20em) {}