> A page can then be tested against the standard and reject or accept as compliant. Pages that don't conform with the specification won't be rendered. It is explicitly forbidden for clients to accept any page that doesn't conform with the specification.
it's as if nothing was learned from the XHTML debacle
I think XHTML failed because it didn't give web devs any new capabilities, so most didn't feel the need to learn it and do the extra work of getting their tags correct.
Then html5 came along, providing all kinds of shiny goodies and saying not to bother with the tags. In the end, a more rigid standard would have been nice.. (Though this is mostly about the skin deep part of the standards.)
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It's as if nothing was learned from AI winter[]! it's obviously a technology dead-end.
[] https://en.wikipedia.org/wiki/AI_winter