In the Qt for WebAssembly documentation section (all pages), it is mentioned that Qt WebSockets module is supported, but it does not mention that WebSocketServer is not supported.

https://doc.qt.io/qt-6/wasm.html#supported-qt-modules

To those familiar with the browser development world, this may be obvious, but it isn't obvious to those that may be wanting to try out WebAssembly coming from more traditional Qt development targets.

I believe it should be mentioned that WebSocket servers are not supported in WebAssembly.

I think a likely place would be somewhere near the list of supported Qt modules.