I don't want to let you wait for Monday. But I had to become clear about some issues.
First! User devices dependent ePubs could be done by producing different versions, e.g. a version for Kindle, for KF8, for '
pure' .epub readers, and so on.
Or to use one stylesheet, fitting all, or let's better say some different users devices via
media queries: I read some
info (a bit theoretical) and the
w3 schools page. To understand it right: A Kindle looks in the Styles list for the Kindle reserved stylesheet and uses automatic that one, a KF8 auto-detact the KF8 stylesheet and so on? Fine!
But there is a very real other problem: I couldn't test these versions, as I got only my Tolino 3HD.
Standard lists in <li> tags. By the time @Tex2002ans thought about (
#28), they were already done. A personal register (1030) plus a title register (1190 entries).
Especially in regard to the latter and to the size of a Kindle PW or Tolino reader (6 inches), a two columns register seems me not so useful anymore.
The book
Werke comes in 6 volumes, but these registers only reference the journalistic work of Joseph Roth, Volume I, II & III. The roman numerals in the register entries indicate these volumes, followed by latin numbers indicating the page numbers. As there are no page numbers in an ePub, the registers introduced to the ePub as a visual copy only would be of limited use/value, while they only would indicate the 'zone', where is to find something (e.g. in beginning, middle or at the end).
To make the entries valueable it means making them functionable/clickable. And that would mean an intensive work of months, maybe years. Just now I don't know if I want to do that.
That would mean (a more detailed assessment is done): about 6000 links.
I would have to insert both registers to each volume, ... or making one volume out of three with 3225 (1115/1030/1080) closely printed paper book pages. Scaling the ereader to 22 or 25 lines per screen page, the ePub would got about 6000 to 7000 screen pages. Is that anymore to handle ... by humans and/or the ereader?
Blaming God and ourself!