[koito17]

To add to the author's list of examples, the regex test site Regex 101 (http://regex101.com/) relies on WebAssembly. To verify this in Firefox, you can set javascript.options.wasm to false, and you will be instructed to use a browser supporting WebAssembly.

If you're willing to risk some safety guarantees, then you can embed SQLite in Go without cgo by using WASM builds of SQLite. In particular, this package: https://github.com/ncruces/go-sqlite3

Note: the risk here is that it's unclear how well-tested SQLite WASM builds are compared to native builds for things like data integrity. With that said, in most of my personal projects using Go, I frequently reach for the WASM builds because it keeps builds fast and easy.

Also, I want to mention that I have seen web apps that are C# / Blazor programs compiled into WebAssembly. The accessibility is predictably terrible, but I have seen at least one such web app in the wild. I assume this is largely why one doesn't encounter WASM web frameworks often. In any case, WASM is surprisingly useful in many niches, and that's kind of the problem for WASM's visibility: the niches where I find WASM useful are almost completely disjoint from each other. But it's a solid technology nowadays. The only real gripe I have is the fact that only wasmtime seems to fully support wasm32-wasip2. You can actually compile quite a lot of Rust backend stuff into WASM and run that instead of a container. Not that this is particularly useful, but I've found it interesting as an exercise.