Runtime

WASM With Web APIs

Canvas, WebGL, WebGPU, DOM, BOM, audio, camera, files, workers, service workers, and WASI.

webglwebgpudomworkerswasistable

WASM generally works with browser APIs through JavaScript glue. A module imports host functions, then JS calls Canvas, WebGL, WebGPU, DOM, Audio, Camera, File, Worker, or Service Worker APIs on its behalf.

Canvas and WebGL are common Emscripten targets.
WebGPU can be driven through JS bindings.
WASI is a non-browser system interface and requires a compatible host or polyfill.
Future proposals may improve direct integration, but portable code should still design explicit host bindings.

References

MDN WebAssembly concepts