If you want to see something useful in that empty space, the obvious thing to put there is the page title. (And you don't need to show the URL text at all to make it copyable.) User-visible URLs are a Bad Idea in general https://news.ycombinator.com/item?id=7679423 . If you badly want to have the tree-structured site guide that people abuse path segments for, that can happily be implemented in some other way and displayed in the same space too.