Twitch rewrote their entire video player in C++ and compiles it down to WebAssembly with Emscripten. That way the same player can be compiled to the web, as to

Twitch rewrote their entire video player in C++ and compiles it down to WebAssembly with Emscripten. That way the same player can be compiled to the web, as to iOS, Android, game consoles etc. That’s a huge business case when you want to create a module to support a wide variety of platforms and targets.