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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.
HTML and JavaScript are two different things, but they are complimentary. HTML is a markup language designed for defining static web page content. It is what gives a web page its basic structure. JavaScript is a programming language designed for performing dynamic tasks within that page, like animation or a search box. JavaScript is designed to run within the HTML structure of a website and is often used multiple times. If you're writing code, your JavaScript will be more easily accessed if you place them in separate files.