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Jsx doesn't "render to xhtml". Its syntax is similar to XML, but not the same. It's similar to HTML, but not the same. It's similar to XHTML, but not the same. In most react apps it renders to function calls like createElement or _jsx. The reconcile will turn these into DOM objects without any markup representation at all.

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Do you have to close all of your tags? Yes. Is the markup based on HTML with XML rules like closing tags? Yes. Do you even have to close the tags of your custom components? Yes. When generating your createElement sequence from JSX, does it create or close tags in a different order/hierarchy than what you specified in the JSX? No. Does it emit markup or element creation calls that match the parsing behavior of HTML5? No.

Walks like an XHTML duck. Talks like an XHTML duck. It's an XHTML duck despite the JS interop and the lack of DTD preamble.

Does not have namespaces (in react), CDATA, schemas, and more. And none of this is "rendering".

The "reconcile" (my God do geeks love making what they do sound fancier than it is) does not match the HTML5 parser "reconciliation" spec. The DOM element API "emissions" match the order triggered by the markup parsers. Y'all are tiresome sometimes.

I legitimately don't understand what you're getting at.

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