I don't know of a current way to do front end dev without CSS. The frameworks which allowed you to do that, like Flash, Java Applets, Silverlight are long gone.

I don't know of a current way to do front end dev without CSS. The frameworks which allowed you to do that, like Flash, Java Applets, Silverlight are long gone. You could try Blazor, it's statically compiled in C# and can run either on the server or in the browser, using WebAssembly.