CSS Validator
Validate CSS stylesheets for syntax errors, deprecated rules, and performance issues. Check for browser compatibility, optimize selectors, and ensure best practices. Perfect for front-end developers and designers.
CSS Best Practices Guide
✓ Best Practices
- • Use CSS custom properties (variables)
- • Keep selectors simple and specific
- • Group related styles together
- • Use shorthand properties when possible
- • Minimize use of !important
- • Use meaningful class names
- • Optimize for performance
- • Include vendor prefixes for new features
- • Use media queries for responsive design
- • Comment your code for clarity
✗ Common Mistakes
- • Overly complex selectors
- • Missing vendor prefixes
- • Using deprecated properties
- • Duplicate or redundant rules
- • Missing units on numeric values
- • Invalid color values
- • Unclosed braces or syntax errors
- • Overusing performance-heavy properties
- • Poor specificity management
- • Inconsistent naming conventions
Sample CSS Code
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