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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.
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.