CSS Validator

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Check if your CSS code contains any syntax errors to be corrected, avoiding styling problems in the layout of your website. If any syntax errors are encountered while parsing and debugging your code, this tool will display an error report with the problem description, indicating whether the problem is an unknown property or an unexpected entry, or any other type of incompatibility with the CSS language. It's recommended that you review your CSS code before submitting it to production environments.
[ Wikipedia: CSS ]
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