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Oxygen XML Author includes a built-in validator used for validating HTML documents. It is based upon the W3C HTML Validator and the HTML documents are validated against the W3C HTML5 specification. The validator in Oxygen XML Author only supports HTML5 structure. It presents the errors in the editor similar to XML documents. It also checks the embedded CSS content and the warnings and errors are presented similar to the CSS editor.

By default, HTML documents are validated using the W3C HTML Validator engine, but you can create or edit a validation scenario to specify that they are validated using the default engine that validates against the Relax NG-Compact Schema specified in the HTML framework.