CSS Validator

About CSS Validation

CSS validation ensures your stylesheets are error-free, standards-compliant, and will render consistently across different browsers. Our CSS validator checks for syntax errors, invalid properties, deprecated features, and compliance with CSS3 standards. Valid CSS improves website performance, maintainability, and cross-browser compatibility.

Why Validate CSS?

• Cross-Browser Compatibility: Valid CSS works consistently across all browsers
• Better Performance: Error-free CSS parses faster
• Easier Maintenance: Clean CSS is easier to debug and update
• Professional Quality: Shows attention to web standards
• Future-Proof: Standards-compliant code ages better

Common CSS Errors

• Missing semicolons between declarations
• Mismatched or missing brackets
• Invalid property names or values
• Incorrect color format syntax
• Deprecated or vendor-specific properties

Best Practices

• Validate CSS regularly during development
• Use modern CSS3 properties when appropriate
• Include vendor prefixes for better compatibility
• Organize CSS with proper comments and structure
• Test across multiple browsers after validation

Frequently Asked Questions

Q: What is CSS validation?
A: CSS validation checks your stylesheet code for syntax errors, invalid properties, and compliance with CSS3 standards.

Q: Why validate CSS?
A: Validating CSS ensures cross-browser compatibility, catches syntax errors early, and improves code quality and maintainability.

Q: What CSS errors are most common?
A: Common CSS errors include missing semicolons, invalid property names, incorrect color values, and mismatched brackets.