It existed also in DTD (Document Type Definition) used with HTML 4 and below, an... | Hacker News

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		lkuty 3 months ago \| parent \| context \| favorite \| on: Why can't HTML alone do includes? It existed also in DTD (Document Type Definition) used with HTML 4 and below, and XML. Came fromn SGML too I guess.

tannhaeuser 3 months ago [–]

Yes it did, and there are HTML 5.x DTDs for HTML versions newer than HTML 4.x ar [1], including post-HTML 5.2 review drafts until 2023; see notes at [2].

[1]: https://sgmljs.net/docs/html5.html

[2]: https://sgmljs.net/blog/blog2303.html

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