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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.
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.