Learn WebAssembly: Build web applications with native performance using Wasm and C/C++ (PDF True)

You will start with the evolution of web programming, the state of things today, and what can be done with the advent and release of WebAssembly. We take a look at the journey from JavaScript to asm.js to WebAssembly. We then move on to analyzinge the anatomy of a WebAssembly module and the relationship between the binary and text formats, along with the corresponding JavaScript API.