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Both className and htmlFor are native.

https://developer.mozilla.org/en-US/docs/Web/API/Element/cla...

https://developer.mozilla.org/en-US/docs/Web/API/HTMLLabelEl...

Woah.

Yes, but it's JS, it isn't vanilla HTML.

It's almost identical to vanilla DOM, though, which does use className and htmlFor.

I'm not sure that the compilation aspect is relevant - pretty much all modern frameworks using a template language have a compilation step. ngFor doesn't exist in the browser after all! ;)

You're confusing the XHTML/HTML and JavaScript API naming schemes

I'd say it's JSX doing that because those attributes are clearly on the declarative/markup side of the divide, not the procedural/imperative dom manipulation side.