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XSL is a language for expressing style sheets. An XSL style sheet is, like with CSS, a file that describes how to display an XML document of a given type. XSL shares the functionality and is compatible with CSS2 (although it uses a different syntax). It also adds: 1  A transformation language for XML documents: XSLT.
In practise, very few XHTML documents are served over the Web with the correct MIME media type, application/xhtml+xml. Whilst authored to the stricter rules of XML, they are sent with the media type for HTML (text/html). The receiving browser considers the content to be HTML, and does not utilise its XML parser.