It does WebGL stuff. Experimental. Need more docs.
The main example is in example/wasm, and you will want to run the build.sh in there to generate the WASM.
If you wish to use the built in host (since WebAssemblies require a host), you need to run example/webserver/run.sh which will create a HTTP server at localhost:8090.
The webserver is able to listen to changes in the example/wasm folder and the root project folder. When it detects a change it will reload the page automatically.