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WebAssembly or wasm is a new portable, size- and load-time-efficient format suitable for compilation to the web.

Official site:

Presentation slides and transcript:

Browser support

Internet Explorer: no
Firefox: 52+
Chrome: 57
Safari (WebKit): In development (source)
MS Edge: 15, by enabling “Experimental JavaScript Features” flag (source)
Opera: 44 (source)


Game engines with WebAssembly support

Emscripten: compile C++ to WASM

Installing Emscripten compiler


# Install git cmake build-essential python2.7 nodejs default-jre
sudo apt-get install git cmake build-essential python2.7 nodejs default-jre
tar -zxvf emsdk-portable.tar.gz
cd ./emsdk-portable
./emsdk update
./emsdk install sdk-incoming-64bit #If you are getting "collect2: error: ld returned 1 exit status" error, try running ./emsdk install -j1 sdk-incoming-64bit
./emsdk activate sdk-incoming-64bit
cd emcscripten/incoming
./ build binaryen
cd ../..
source ./

WasmExplorer: see C++, WebAssembly and x86 instructions side by side