A linter for CSS code. More information: <https://github.com/CSSLint/csslint/wiki/Command-line-interface>.

• Lint a single CSS file:
  csslint file.css
• Lint multiple CSS files:
  csslint file1.css file2.css file3.css
• List all possible style rules:
  csslint --list-rules
• Specify certain rules as errors (which result in a non-zero exit code):
  csslint --errors=errors,universal-selector,imports file.css
• Specify certain rules as warnings:
  csslint --warnings=box-sizing,selector-max,floats file.css
• Specify certain rules to ignore:
  csslint --ignore=ids,rules-count,shorthand file.css

© tl;dr; authors and contributors