To try the WASM build, use these steps:

cargo build --target wasm32-unknown-unknown --bin graphicstest
cd examples/graphicstest
mkdir -p generated
wasm-bindgen ../../target/wasm32-unknown-unknown/debug/graphicstest.wasm --out-dir generated --no-modules
cp index.html generated/

Then serve for example with

cd generated/
python -m SimpleHTTPServer

and go to

http://localhost:8000/index.html