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The rendering of an HTML document in the Author mode is driven by a CSS stylesheet that conforms to the version 2.1 of the CSS specification from the W3C consortium. Oxygen XML Editor also supports stylesheets coded with the LESS dynamic stylesheet language.

To associate a CSS with an HTML document:
  1. Use the Associate XSLT/CSS Stylesheet action that is available on the toolbar or in the Document > XML Document menu.
  2. In the resulting dialog box, specify the URL for the CSS file and optionally a title, and click OK.

Result: A CSS association is added in the HTML document in a <link> element, as specified in the W3C stylesheet specification.