#Validation is the process of checking something against rules. When you're a beginner, it's common to make a lot of mistakes when writing CSS rules. How do you ensure that the content you write is 100% accurate and meets W3 quality standards?
If you use CSS, your code needs to be correct. Incorrect code can cause unexpected results in the appearance or functionality of your page.
However, if you want to validate a CSS stylesheet embedded in a (X)HTML document, you should first check that (X)the HTML you are using is valid.
Tools to check the validity of (X)HTML documents: Validate (X)HTML documents.
The CSS Validator checks your cascading style sheets to ensure they comply with the CSS standards set by the W3 Consortium.
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