/*! dont delete me */ .foo{ /* ha */} @import "another.css"; /* I'm empty - delete me */ empty { ;} .test{color:red} @media (-o-device-pixel-ratio: 1/10) { } a[href$="/test/"] span.test{} #foo{ } :after{ ;} @media print { /* empty */ body{ } } @media screen { /* this rule should be removed, not simply minified.*/ .breakme {} .printonly { display: none; } } @media print { /* empty */ @media (min-aspect-ratio: 1/1) { /* empty */ a { /* empty */ } } /*! imp: weird but it may happen */ b{ } }