CSS Selector Tester — Validate CSS Selectors Online
CSS Selector Tester Online — Free Tool
Test and validate CSS selectors instantly. Check selector syntax, calculate specificity, and understand selector behavior.
Why Test CSS Selectors?
- Validate Syntax: Ensure your selectors are syntactically correct
- Understand Specificity: See the specificity score for each selector
- Learn Selectors: Understand how complex selectors are parsed
- Debug Selectors: Find issues with selector syntax
Features
- Selector Validation: Check CSS selector syntax correctness
- Specificity Display: See (ID, Class, Element) scores
- Error Detection: Get detailed error messages for invalid selectors
- Batch Testing: Test multiple selectors at once
How to Use
- Enter CSS selectors (one per line) in the input area
- Click Test Selector to validate and analyze
- Review validation status and specificity scores
Privacy & Security
All processing happens entirely in your browser.