The way Emscripten does it, IIRC, doesn't require any special browser support. The toolchain generates glue code in JavaScript to support calls between dynamically linked Wasm modules.
Do you happen to know where can I check out the cutoff version for each browser? https://caniuse.com/?search=wasm doesn't have it (or other things like WasmGC for that matter)
I believe dynamic linking has been a core feature of WebAssembly from the beginning. You have always been able to load multiple Wasm modules in the same isolate and make them call each other.
(But, language toolchains have to actually be designed to use this feature. Most aren't.)
