Agree, but HTML itself doesn't have and doesn't need "transclusion" when HTML is understood to be an SGML vocabulary and SGML has all these things and more, from basic sharing of headers/footers and other markup fragments [1] to parametric macro expansion and event-based templating [2].
> when HTML is understood to be an SGML vocabulary and SGML has all these things and more
HTML hasn’t been SGML for a long time, and it’s never going to go back. Understanding it to be an SGML vocabulary would be a serious error. In the context of HTML, what SGML supports is even more irrelevant than it was twenty years ago (and it was pretty thoroughly irrelevant even then).
HTML hasn’t been SGML for a long time, and it’s never going to go back. Understanding it to be an SGML vocabulary would be a serious error. In the context of HTML, what SGML supports is even more irrelevant than it was twenty years ago (and it was pretty thoroughly irrelevant even then).