NDndriscoll·Jul 29, 2024
If you're using it as a template language for your own pages, you can of course just write it correctly (this is not different than needing to use correct syntax for react code to compile).
If you have someone else's documents, or need to mass convert your own to fix them, there's HTML tidy[0]. This one is quite useful to be able to run XML processing CLI tools on scraped web pages.
But the real power is in delivering XML to the client, not HTML. This lets you work in the domain model directly on the frontend, and use XSLT to transform that into HTML for display. So of course you'd use well-formed XML in that case.
Imagine if you didn't have a distinction between APIs and pages; you just returned the data along with a link to a template that says how to display it and (ideally) a link to a schema definition. Modifying templates for compon
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ents could be as easy as modifying CSS attributes in the browser console, giving the next generation an easy way to peak and play around with how it all works as they're growing up. We were so close, and then things veered off into the hellworld that is the modern web.
[0] https://github.com/htacg/tidy-html5