Next, Flash emulation running under WebAsm?
The lead developer is a Newgrounds employee (Mike Welsh) and is the author of Swivel [2], a Flash to video converter already in use on Newgrounds. They're targeting both browsers and the desktop with Rust and WebAssembly, and it can already run most basic Flash animations I've tested.
I personally am very excited, having grown up in the Flash era of the Internet, where everything from online coding languages (Scratch) to authors' websites (J.K. Rowling, others) to games and webcomics (take your pick) were made in Flash. Flash was such a universal medium that there's still significant amounts of our Internet history that nobody's converted - or been able to convert - to HTML + JS. And even then, many conversions are buggy and lacking in functionality. Having something like Ruffle available as an extension or a wrapper for legacy websites would be incredible.
If anyone's interested in Ruffle's roadmap, it's available here [3].
[1] https://github.com/ruffle-rs/ruffle