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HTML has never been XML. And HTML + CSS3 is Turing complete without Javascript anyway: https://accodeing.com/blog/2015/css3-proven-to-be-turing-complete https:

• kitsune_ 5y ago
  Amen, I think if memory serves correctly HTML was SGML inspired and once XML became popular there was a XHTML standardization push for a brief time. I think you could argue that the ubiquity of HTML led to people see value in something like XML back in the late 90's / early 00' and HTML drove XML invention and adoption and not the other way around.