Is it possible to write such an application without brakes using css/html/svg?

Question

Web development

Actually, here is a demo of the application - https://www.youtube.com/watch?v=G6yPQKt3mBA There is another demo on the same topic - https://www.youtube.com/watch?v=M-8k8GEGZPM

Answer 1

It won't work, at least JavaScript is needed. It is possible without a back end, but the problem with js is that it is single-threaded, it simply cannot do everything at once. Well, that's what I think, I could be wrong.