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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.
1 HTML can be parsed as text/html and application/xhtml+xml, over and above what XML can be parsed as: application/xml.  XML and XHTML have to have a closing element for each open element. Depending on the element, HTML doesn't care whether an element has a closing tag or not.