[jauntywundrkind]

> Can I (practically) use Rust or Go in the browser via wasm already!?

You can (built into rust and tinygo for go.)! And wasm-threading has been around for a while! https://webassembly.org/features/ But I don't think these wasm-threading capabilities are well harnesses by any languages yet.

There been a decade of webworkers being super possible. That does get multi-threading! With transferable memory & everything. So, this isn't like some new super non-js thing. Some folks do use workers, but alas not popular enough, not something React or Angular helps steer folks to.

Whats super neat and tricky here is that the iframe in separate origin-agent-cluster has a full DOM implementation that's there & raring to go. We already could have tried using jsdom or happy-dom or a wasm-powered alternative in a worker to do something like this, already. This is super cool though because it's much lower code! It uses a dom runtime that's already loaded & available (the browser's) rather than having to ship & load a separate DOM runtime.