Having something like REPL available makes, IME, learning a new language much easier - and this is a sort of hodge-podge way to get something similar for HTML/C

Having something like REPL available makes, IME, learning a new language much easier - and this is a sort of hodge-podge way to get something similar for HTML/CSS, so I can see why it might be an advantage. Less so for when you're at a stage where you can do large projects - because you're not redoing things as often, but when it's just short snippets where you want to drill multiple variations to try out ideas and to get the stuff wired into your head, it seems to be advantageous to have that sort of dialogue with the computer.