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Doctype declaration is not a HTML tag nor element, but is it HTML code? Some of my peers told me it is HTML still because it is part of a HTML document, but others told me it is instead something called SGML. Can someone please clarify?

viralsanjeev
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    https://softwareengineering.stackexchange.com/questions/93296/relation-and-differences-between-sgml-xml-html-and-xhtml – Martin Dec 31 '20 at 19:25
  • Your question is most probably an opinion, rather than something that can be definitively answered. – Martin Dec 31 '20 at 19:25
  • Based on the link you shared it seems like the doctype declaration would be both? – viralsanjeev Dec 31 '20 at 19:38
  • "Both" is probably the best way to think of it, yes. The doctype has its origins in SGML, but its use in modern HTML has become divorced from those origins. – Alohci Jan 02 '21 at 18:20

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