Validating CSS Files

For CSS validation, use the W3C CSS Validation Service: Access the CSS Validator: Go to the W3C CSS Validator at https://jigsaw.w3.org/css-validator/. Choose How to Validate: By URI: Validate by entering the URL of a hosted CSS file on the By URI tab. By File Upload: Use the By File Upload tab, browse for your local CSS file, and select it for validation. By Direct Input: Copy a...