These tricks by combining parts of URLs to do relative linking on scheme, host, etc. are little known but useful; I was expecting them to show up in the article

These tricks by combining parts of URLs to do relative linking on scheme, host, etc. are little known but useful; I was expecting them to show up in the article. Going back to the debate over Chrome's potential dropping of "http:// http:// in the address bar, if they were to use "//" instead they would have an argument for technical correctness because the default protocol of "http:" could be assumed. But having no leading "//" visually confuses it with a relative path omitting the host, because it breaks the signifier for the authority component of the URL. Just a thought.