Challenge: Best JavaScript Setup for Quick Prototyping

There difference between the first and second example of the 'dream setup' is that the author is either completely ignoring the setup which was done to build the fooo.fr server, and that a simple static page is not the same as building a javascript based page (though it shouldn't be a huge challenge).

Having said that, is CodePen a suitable comparison of the modern version of what fooo.fr allowed in the past?

The next question becomes, what would it take to make something like codepen which let you post your code to your own domain?