XHTML (Extensible HyperText Markup Language) is an XML mark up language that extends HTML.
Why XHTML when HTML is already there?
HTML is derived from SGML (Standard Generalized Markup Language) and it evolved to be too flexible. The motivation to create a XHTML was to make a more restrictive markup language that conforms to XML.This will allow standard XML parsers to parse XHTML.
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