Engineering teams at Mozilla and Epic ported Unreal Engine 3 to the HTML5

Deploying C++ to JavaScript using Emscripten:
http://www.joshuagranick.com/blog/2013/04/21/deploying-cpp-to-javascript-using-emscripten/

This article also talks about using Emscripten from Visual Studio 2010, we can use VS IDE to integrate with llvm-clang and emscripten toolchain.


Unreal JavaScript:
http://blog.bitops.com/blog/2013/05/01/unreal-javascript/