This package scores your CSS on several criteria and comes up with a score.

• Maintainability
  • Source lines of code
  • Average # selectors per rule
  • Max # selectors per rule
  • Average # declarations per rule
  • Max # declarations per rule
  • Number (or %) of rules with more selectors than mode selectors per rule
  • Number (or %) of rules with more declarations than mode declarations per rule
• Complexity
  • Selector complexity (total/mode)
  • Selector specificity
  • Number of atrules like @supports, @media and @container
  • Vendor prefixes
  • Number of selectors more complex than selector mode (or mean)
  • Number of ID selectors
  • Number of !importants
• Performance
  • Number of @import statements
  • Filesize
  • Code duplication
    • % of unique selectors
    • % of unique declarations
  • Empty rules

• Maintainability: Range of selector complexity
• Performance: Size and % of embedded base64 content