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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.
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.