Occasionally the back-conclusion CMS system has limits that drive you to have a consistent set of components on all pages. e.g. all pages must make use of a rel=canonical tag, even when it’s to issue to itself. Hreflang tag #one could well be the self-referencing entry in this case. And https://1001bookmarks.com/story18701288/the-smart-trick-of-was-ist-ein-canonical-tag-that-nobody-is-discussing