Hyperlinks aren't perfect: they're brittle, and links to specific headings break very easily. Nonetheless, foo.html#bar degrades admirably.
miniblog.
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Ted Nelson introducing some of the basic principles of Xanadu, his hypertext design: https://www.youtube.com/watch?v=hMKy52Intac
He stresses the importance of visible hyperlinks, an interesting choice when some UI designers argue that today's underlined links are distracting for readers.
Some fun early discussions on what hyperlinks should look like, even including a proposal for typed links!
Fascinating introduction to early hyperlinks: there were 'linkbases' (storing links separately from the content), they weren't 1:1 (one link could point to multiple destinations) and had gossip protocols to update on other servers!
https://moocs.southampton.ac.uk/websci/2014/02/21/open-hypermedia-web/ https://edshare.soton.ac.uk/6158/1/Open_Hypermedia.pptx