The point of the flags, manifests or whatever is so functionally can set by the site. Like one site wants to support live chat and another wants to support bull

The point of the flags, manifests or whatever is so functionally can set by the site. Like one site wants to support live chat and another wants to support bulletin board style posting. The web is the best application runtime for making clients. However, I don't think it's existence invalidates the creation of these kind of protocols and server APIs. In fact some web standards such as RSS feeds could be described as such.