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Oxygen XML Editor provides a special framework for editing HTML files (html or htm file extensions) with a variety of specialized editing features, including validation, content completion, syntax highlighting, HTML-specific actions, and more.

Oxygen XML Editor also includes a built-in XHTML framework (files with the http://www.w3.org/1999/xhtml namespace or with the xhtml or xht file extension) that has a full set of features (full editing support, document templates, enhanced CSS rendering, specific actions, validation, content completion, transformation scenarios, and more). Oxygen XML Editor also includes support for importing HTML files as an XML document.