There are some exciting new developments in the world of browser based programming. WebAssembly or wasm is a new portable, size- and load-time-efficient format suitable for compilation to the web. WebAssembly is currently being designed as an open standard by a W3C Community Group that includes representatives from all major browsers.
I’m really excited to test this out. Unreal Engine 4 now supports the new WebAssembly standard (also known as WASM) for HTML5, the fastest and most efficient way to compile and run C++ for the web! They are using Mozilla’s latest Emscripten toolchain (v1.37.9).