How Can I Validate CSS Code Containing Vendor Prefixes?

Ensuring CSS Validation with Vendor Prefixes

Despite the prevalence of CSS properties like -webkit-border-radius and -moz-box-shadow, validation remains elusive. The CSS3 Syntax module permits vendor prefixes, but actual extensions are not recognized.

Recognizing Vendor Prefixes as Errors

The W3C CSS Validator treats vendor prefixes as errors. To mitigate this, the validator now offers an option to convert errors into warnings.

Activating Warning Mode

Expand the "More Options" section within the validator and enable "Reduce Errors from Vendor Prefixes to Warnings." This allows for validation without penalizing vendor prefix usage.

Imperfect Solution

While warning mode provides some validation, it's crucial to note that vendor prefixes remain non-standard. Therefore, CSS employing them is still technically invalid.

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