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If the app transforms the server-provided “UI” into native UI elements, that would be significantly different from just rendering HTML in a webview.

That sounds like a web browser with extra steps.

The "webview" it renders to is native UI this time?

Kind of reminds me of Mozilla XUL (rest in peace...)

OpenLaszlo's LZX also comes close: https://www.xml.com/pub/a/2006/10/11/introducing-open-laszlo...

It's similar but in a format that is more conducive to rendering in the native frameworks on iOS and Android: SwiftUI and Jetpack Compose. HTML and CSS doesn't map very well to these native frameworks.