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iOS, Android, and Fuscia. I just found out that there is now Hummingbird for web as well.

Does Fuchsia use the Material renderer, like Android?

They literally just previewed Hummingbird.

They just announced desktop and web support

Cool! Where can I find an example project to start with if I want to build an app for Linux and Mac as primary targets?

There is an embedder engine API that can be used for other platforms.