For what it’s worth, some markup-first template systems have tried to respect the target format’s structure—Genshi[1] and TAL[2] come to mind, and of course XSL

For what it’s worth, some markup-first template systems have tried to respect the target format’s structure—Genshi[1] and TAL[2] come to mind, and of course XSLT (see also SLAX[3]). I said “markup-first” so that the whole question isn’t trivialized by JSX. [1] https://genshi.edgewall.org/wiki/Documentation/xml-templates.html https://genshi.edgewall.org/wiki/Documentation/xml-templates... [2] https://zope.readthedocs.io/en/latest/zopebook/AppendixC.html https://zope.readthedocs.io/en/latest/zopebook/AppendixC.htm... [3] https://juniper.github.io/libslax/slax-manual.html https://juniper.github.io/libslax/slax-manual.html