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The visual Author editing mode can be customized by creating CSS files to define styles for the XML elements and other components. The Author editing mode supports most CSS 2.1 selectors, numerous CSS 2.1 properties, and some CSS 3 selectors. Oxygen XML Editor also supports stylesheets coded with the LESS dynamic stylesheet language. Also, Oxygen XML Editor has added some custom functions and properties that extend the W3C CSS specification and are useful for a wide range of use-cases for developers who customize Author mode through custom frameworks.