For me the question has been solved for ages. If it is a website - then it is plain HTML with some CSS. The exception is - there will be some JS if we want sau

For me the question has been solved for ages. If it is a website - then it is plain HTML with some CSS. The exception is - there will be some JS if we want saucer flying across screen. If it is an application - the logic will be coded in plain JS that talks to backend using JSON based RPC. No frameworks bar some domain specific libs. Minifying / building step can be included for production. Works well for me.