Having problems with CSS? CSS HTML Validator for Windows (formerly CSE HTML Validator) not only thoroughly checks HTML syntax, but also checks CSS syntax.
That means it's not only an HTML validator, but also a CSS validator (and it checks a lot more than that too).
CSS HTML Validator runs on your own computer so it protects your privacy and is super-fast. More:
It's so easy! To check a document, simply open your document in CSS HTML Validator (a CSS file or HTML file containing CSS from a local drive or via http/https), press F6, and your document is checked with the results displayed at the bottom.
Latest trial version: 23.04