XSL stands for EXtensible Stylesheet Language.
The World Wide Web Consortium (W3C) started to develop XSL because there was a need for an XML-based Stylesheet Language.
HTML uses predefined tags. The meaning of, and how to display each tag is well understood.
CSS is used to add styles to HTML elements.
XML does not use predefined tags, and therefore the meaning of each tag is not well understood.
A <table> element could indicate an HTML table, a piece of furniture, or something else - and browsers do not know how to display it!
So, XSL describes how the XML elements should be displayed.
XSL consists of four parts:
|With the CSS3 Paged Media Module, W3C has delivered a new standard for document formatting. So, since 2013, CSS3 is proposed as an XSL-FO replacement.|