When you serve a web page, the HTML markup and JavaScript is only part of the output the server generates. This output, including the markup and actual text/image content, is served to the people visiting a website, not the code that generates the output.
By having to license the output, everyone visiting a web page would have full commercial rights to the web page's content. Imagine your web page contained a novel text: anyone visiting that page could grab that novel and sell it under a GPL license. This was the issue I was replying to, and said it was not so; the output of a program licensed under GPL is not automatically licensed under GPL also.
So if I completely misunderstood your joke, please correct me. But it makes no sense to me as it is because the source code of a website and the output of that code are two completely different things.
If you share your website's full backend source on every download, you're doing something terribly wrong.