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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.
No, not in any sense of the term. CSS is a styling language, HTML is a document format. They're no more programming languages than a Word document is. Seriously, they're not. JavaScript is of course a programming language, and is present most places you see HTML these days. HTML could be considered like a Word file, and JavaScript like Word macro.