On: Ask HN: Who is using C++ as the main language for ...

[lioeters]

Apparently they're using Wt, "webtoolkit".

https://github.com/thebigG/wPedals/blob/main/src/hello.C

> Wt is a web GUI library in modern C++. Quickly develop highly interactive web UIs with widgets, without having to write a single line of JavaScript.

https://www.webtoolkit.eu/wt