A linter for CSS code.
csslint {{file.css}}
csslint {{file1.css}} {{file2.css}} {{file3.css}}
csslint --list-rules
csslint --errors={{errors,universal-selector,imports}} {{file.css}}
csslint --warnings={{box-sizing,selector-max,floats}} {{file.css}}
csslint --ignore={{ids,rules-count,shorthand}} {{file.css}}