Translations:Reading/Web/Desktop Improvements/Features/Sticky Header/80/en

Why is the sticky header not showing on a certain page?
The sticky header is currently only visible to logged in users using modern browsers on allowed actions and allowed namespaces when the user has scrolled down the page. At time of writing it is only enabled on namespaces: Main, Main talk, User, User talk, Wikipedia, Template, Help, Category, Portal, Module but not old revisions, diffs, history or edit pages.