Other than some fantasy consoles like WASM-4, which have some retro-inspired limitations, there isn't really a standard way to do any kind of GUI in Wasm yet. Wasmer has a non-standard way[1], which they hide behind compilation flags, and involves writing to a bitmap framebuffer, so no hardware acceleration.
[1]: https://medium.com/wasmer/wasmer-io-devices-announcement-6f2...