[cxr]

> Does HTML have the reproducibility that PDF promises? My feeling is that if I store a PDF, it'll look the same in a decade.

Feelings and promises are each one thing. Reality is another. PDF doesn't even look "the same" today. I have serious questions about how often folks who think that PDF is reliably consistent from system to system step outside their bubble and just how diverse their setups are that they're testing on.

> is HTML the same way?

Well the status-quo for copy-and-paste in HTML isn't dogshit, it's comparatively trivial to find and use tools that can thoroughly and exhaustively search your collection (or even write your own), and HTML is a dead simple plain-text format that if worst comes to worst you can read with your eyes (unlike needing to run a bunch of inscrutable code from a PostScript subset through an interpreter before you can do anything with it). So, no, I wouldn't call them the same.