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Found what was messing up the paragraph indent ONLY on Kobo. Fine on other devices or apps. Summary of problem:
If the start of paragraph indent isn't in "em" then the size of if is half the expected on the Kobo H2O original on ePubs sent from Calibre. 1em = 12pt, to get 16pt the indent had to be 1.4em via "remove blank paragraphs and set indent", or manual edit of CSS. Setting it to 32pt gave correct view on Kobo, but then twice what it should be on anything else.
It may have been only the setting to use a file kobo_extra.css, which doesn't exist on my Kobo. See below.
On Device (when Kobo H2O original connected) I made two changes:
1) On "Extended" I unchecked "Enable Kobo Extended Features" presuming that this is what is silently converting ePubs to keypubs on the fly.
2) On "Collections, covers & uploads" I unchecked "Modify CSS", as why would I do this? The CSS works fine on three non-Kobo ePub readers and two ePub apps on phone & tablet. Hovering the mouse suggests this uses some file I think I don't have.
Now the ePubs are ePubs on the Kobo AND they NOW look the same as on all my other ways of reading ePubs! Not only that but unchecking "remove blank paragraphs" "Indent 1.4em" and thus leaving indent at 16pt now works on Kobo (before it was always 1/2 the point size set unless changed to em equivalent.
I don't want silently created kepubs. I want to see what ePubs look like, so I can proof what Smashwords might produce and see what other ePub users (Sony, Nook, Android & iOS apps etc) will see. I picked ePub2 in Calibre. That's what was going to my apps and other non-Kobo eReaders. It's not obvious:
Under Device (when Kobo connected):
On "Extended" tab there is "Enable Kobo Extended Features". It's not clear that if this is checked that you silently get kepubs and not epubs. I've checked in Book Details, and removal of book from device and resending after unchecking and Calibre restart the "Details" changes from Kobo Epub to Epub.
Now I have hundreds of books to fix
On books that have indent & no regular blank paragraphs: Delete all conversions, uncheck Calibre "remove blank paragraph" "Set indent" 1.4em and allow original indent usually in tenths of inches or points. Reload ALL my apps and eReaaders.
On ALL books on Kobo, remove and reload to remove kepubs. I'm not interested in Kobo's propriety extension. Mobi for old Kindles, AZW for newer Kindles and ePub2 for all apps and non-kindle eReaders.
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