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Emscripten is an LLVM-based project that compiles C and C++ into highly-optimizable JavaScript in asm.js format. This lets you run C and C++ on the web at near-native speed, without plugins.

The very beginning of WebAssembly’s story starts with Emscripten, which made it possible to run C++ code on the web by transpiling it to JavaScript... JavaScript run really fast. This subset of JavaScript was named asm.js... It was just the beginning.