[SkookumPete]

Thanks for the tip about the CSS.

The endnote thing is very strange. I finally put all my HTML files into one huge file and brought that into Sigil. Notes worked fine. Then I had Sigil split it into chapters. Notes still work in Sigil and in the browser when I unzip the epub, but not in Azardi or a couple of readers I've tried on Android.

Worse, if I try different things like stripping the "../Text/" from the URLs, Sigil helpfully reverts all my changes when I reload the epub.

Epubcheck detects no problems.