A simple WebAssembly application which will display Hello, WebAssembly! in the browser by getting an element by its ID and setting the text value.
With Go installed, the wasm_exec.js file is obtained from your GOROOT/misc/wasm/ directory. Run:
make build
...to cross-compile the wasm/main.go source to a WebAssembly.
Run the web server which will serve the html/index.html file, load the wasm_exec.js support file, and load the main.wasm WebAssembly:
make serve