Contrary to tha markup some web developers seem to produce, both HTML and XHTML have very well-defined syntax.All
(X)HTML documents should follow a formal structure defined by the World Wide Web Consortium (W3C,www.w3.org),which is the primary
organization that defines Web standards.Traditionally, the W3C defined HTML as an application of the standard generalized markup language
(SGML).SGML is a technology used to define markup languages by specifying the allowed document structure in the form of the document type definition(DTD).
A DTD indicates the syntax that can be used for the various elements of a language such as HTML.
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