They've made a lot of progress, check out https://flutter.dev/

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...