CSS validation checks your Cascading Style Sheets to make sure that they comply with the CSS standards set by the W3 Consortium. The W3C CSS Validator checks for CSS1, CSS2, CSS3, and CSS4 properties.
CSS Validation- vendor extensions
CSS validator use vendor extensions to support older browsers:
| Extension | Browser |
|---|---|
| -webkit- | Chrome, Safari, Opera |
| -moz- | Firefox |
| -o- | Old Opera versions |
| -ms- | Microsoft Edge and Internet Explorer |
CSS validator advantages
- It Helps Cross-Browser, Cross-Platform, and Future Compatibility.
- A good quality website increases search engine visibility.
- As a web developer, your code should not raise errors while seen by the visitors.