Depending on the pages, the sticky header makes a different use of editing icons. When reading an article, at the sticky header the double squared brackets indicates Source editor and the pencil icon the Visual Editor.
When editing an article, the pencil icon at the sticky header allows to change from one editing mode to other by opening a submenu, choosing between Visual mode (eye icon) or Wikisource (double brackets).
When reading a page where is only possible to edit with the Source editor (like the eswiki Café), the sticky header shows only the Pencil icon, instead of the double brackets since it is only possible to edit in source. (This has been reported by a user of eswiki during the current post-deployment discussion).
