:prefixed { Level: error; diagnostic: "Avoid prefixed properties"; } style-value[name="color"]:not(:computed) { level: error; diagnostic: "Avoid color literals"; } declaration:important { level: error; diagnostic: "Avoid !important"; } declaration:unknown { level: error; diagnostic: "Unknown property"; } declaration:empty { level: error; diagnostic: "Empty ruleset"; } @stat --total-size { type: bytes; } :root { collect: --total-size; } /* vi: ft=css */