csslint
Lint CSS code. tldr-pages
On several platforms
Several platforms
Lint a single CSS file
csslint file.cssIdentifyLint multiple CSS files
csslint file1.css file2.css ...IdentifyList all possible style rules
csslint --list-rulesIdentifyTreat certain rules as errors (which results in a non-zero exit code)
csslint --errors=errors,universal-selector,imports file.cssIdentifyTreat certain rules as warnings
csslint --warnings=box-sizing,selector-max,floats file.cssIdentifyIgnore specific rules
csslint --ignore=ids,rules-count,shorthand file.cssIdentify