You are right, web-site's design and a web-site's user interface are not the same. If anything the UI is just 'a space where stuff can happen' the design should

You are right, web-site's design and a web-site's user interface are not the same. If anything the UI is just 'a space where stuff can happen' the design should be responsible for handling whatever is happening. As long as HTTP reigns supreme as a transfer protocol, so will formatting source files as text...