Bookmarks are not features of Kitmaker/Armorama/Discourse.
Bookmarks are features of the web-browsers we use.
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Indeed…
Wikipedia: “According to new results of the research done on the history of bookmarks, there are indications that bookmarks have accompanied codices since their first emergence in the 1st century AD.[1] The earliest existing bookmark dates from the 6th century AD and it is made of ornamented leather lined with vellum on the back and was attached with a leather strap to the cover of a Coptic codex (Codex A, MS 813 Chester Beatty Library, Dublin).[2] It was found near Sakkara, Egypt, under the ruins of the monastery Apa Jeremiah. Further earliest bookmarks and remnants of them have been found in Coptic codices dating from the 1st to the 11th century and in Carolingian codices from the 8th to the 12th century. Bookmarks were used throughout the medieval period,[3] consisting usually of a small parchment strip attached to the edge of folio (or a piece of cord attached to headband).”
—mike 
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