That's literally how Flutter started. "What if we don't have to be backwards compatible? Let's delete the HTML parsing quirks... and expensive CSS selectors... and... all of the DOM... and JavaScript... and why do we have markup even..."
They're expanding from mobile, ios and android, working on flutter for desktop and web.
They move to the dart language early on in their experiment.
Dart has an online playground https://dartpad.dev which has experimental flutter mode.
Found this flutter hello world! example, don't know how long the link will work. https://dartpad.dev/experimental/embed-new-flutter.html?id=2...