A year or so ago I posted something about some experimental software that displays epub3 on an Apache web server. If you unzipped the epub in the DOCUMENT_ROOT
and edited one line of a config file the epub displayed on the server in book-like fashion.
I gave up on that project for various reasons. I got it to work with epub3 produced by Sigil and Jutoh but free sample epubs from github often broke. I also didn't like being dependent on a desktop editor like Sigil or Jutoh for making changes, always followed by scp copying.
So now, basically since the old people stay home virus scare from a week ago, I've rewritten last year's epub3 stuff as server-side php that displays simple web pages--enhanced by page sequencing with Next Page and Previous Page buttons, plus a slideshow and a gallery mode. It isn't in any way epub. It's web pages that act like a book./index.php?robopage=Flies/Library/Sandy-Pittendrigh/Dryflies/
Lots of stuff still missing, like javascript display:none button to collapse the TOC and then back again, and a cookie set mechanism so the codes remember the last page you visited, so if you come back next week you'll automatically jump back to where you were last time. Perhaps in a few more days.
This is a book about Montana Trout Flies, which probably isn't interesting to anyone here. But it is a good demo I think.
https://montana-riverboats.com/index...drigh/Dryflies
....the codes are on github.com but not pushed out to the master yet. It will be a few more days before I do that.