[docmars]

I'm thinking more in terms of browsing, not just selectable items in a menu, but any scrollable content.

A real-world analog would be adhesive color tabs people stick to the sides of books or printed documents to mark a paragraph non-destructively, so they can return to that point later more easily.

Think anchor headings, except user-driven, because many websites don't even use anchors to enable linking to page sections by URL hashes, and without inspecting headings for anchors (by tapping or long-pressing on them), nobody would ever know it's a feature.

I wish I could just mark my current scroll position and return to it later by navigating back + forth between the ones I've saved for a page. I've lost count how many times I've made mental notes saying "This is interesting, I'll return to this bit later" only to struggle finding it again because it's lost in a sea of text. Browsers have no way to temporarily bookmark bits of content without developers (or CMS'es) being smart enough to anchor headings and sections.