I'm offered to build a project, a web application, or basically a website. But the client prefers that I use electronjs to develop it.
But as far as I know (Correct me if I'm wrong), electronjs is for building cross-platform desktop applications ONLY which can run on any OS like Windows, Linus, Mac, etc but not on a browser via URL. Since it uses HTML, CS, JS, or basically the browser's language, it may have confused my client to think that it can be used also for building web applications.
So my questions are:
I would say no. Electron is used to build cross-platform desktop apps, and is not generally used to build websites. You could probably do it, but this is limited to very special circumstances, I would advise against it. You're probably better off using a framework meant to develop Single Web Apps, like React or Vue.