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Oxygen XML Author includes a built-in CSS Validator, integrated with general validation support. This makes the usual validation features for presenting errors also available for CSS stylesheets.

When you edit a CSS document, you can access the CSS validator options by selecting Validation options from the Document > Validate menu.

The CSS properties accepted by the validator are those included in the current CSS profile that is selected in the CSS validation preferences. The CSS 3 with Oxygen extensions profile includes all the CSS 3 standard properties plus the CSS extensions specific for Oxygen that can be used in Author mode. That means all Oxygen-specific extensions are accepted in a CSS stylesheet by the built-in CSS validator when this profile is selected.