Validating CSS Stylesheets
Oxygen XML Developer 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 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 and the CSS extensions specific for Oxygen. That means all Oxygen-specific extensions are accepted in a CSS stylesheet by the built-in CSS validator when this profile is selected.