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XSL is used to refer to a family of languages used to transform and render XML documents. CSS is a style sheet language used for describing the presentation semantics (the look and formatting) of a document written in a markup language. Hence XSL and CSS are not the same and not interchangeable.
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.