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> Way back in the day, HTML was implemented as an application of SGML.

[citation needed]

I'm unaware of basically any implementation of HTML treating it as an application of SGML; the only notable case I'm aware of is the old HTML validator.

Tim's original implementation of HTML didn't treat it as SGML.

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> I'm unaware of basically any implementation of HTML treating it as an application of SGML; the only notable case I'm aware of is the old HTML validator.

Plugging my XML Prague 2017 paper on a SGML DTD for W3C HTML 5.1 here [1].

[1]: http://sgmljs.net/blog/blog1701.html

I was looking for that earlier, it's a fascinating paper, thanks! :)

Sorry, maybe I should have said "inspired by" or something.

You're right, I'm not aware of any actual implementation, outside of validators, that treated it as such.

I did actually say a little later that no web browsers actually implemented it as SGML, but the sentence you quote could cause confusion; but it's too late for me to edit now.

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