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In page Standard Generalized Markup Language:
"While HTML (Hyper Text Markup Language) was developed partially independently and in parallel with SGML, its creator, Tim Berners-Lee, intended it to be an application of SGML.[citation needed] The design of HTML was therefore inspired by SGML tagging, but, since no clear expansion and parsing guidelines were established, most actual HTML documents are not valid SGML documents. Later, HTML was reformulated (version 2.0) to be more of an SGML application; however, the HTML markup language has many legacy- and exception-handling features that differ from SGML's requirements. HTML 4 is an SGML application that fully conforms to ISO 8879 – SGML.[1]
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