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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. HTML and JavaScript are two completely different things. HTML is a markup language designed for defining static web page content. JavaScript is a programming language designed for performing dynamic tasks.