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Originally Posted by Inquisitive_Ram
"doing so triggers Kobo’s bad ebook renderer, which is based on A.D.E"
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As you've seen, calling Kobo's e-pub renderer 'bad' is a hot take. The two engines are different, each with their pros and cons and unique bag of bugs. Personally, I only use Kepub on my reader, but ironically, the general consensus is that ADE has better typography. In the end, this will be a matter of personal preference.
I don't think it's right to blame Standard E-books for the incompatibility, however. If their e-books are standard compliant, and it is Adobe/Kobo who refuse to fix bugs that causes the formatting to fail, it's clearly a fault with Adobe/Kobo.
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So my question is whether there is much material difference between
a) sending a (well formatted) epub file to the Kobo via Calibre which converts to kepub)
b) reimporting the books as kepubs from standard books and then sending them to the Kobo (via calibre)
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There really isn't much difference between epub and kepub. Only the addition of <span> elements within the text without any formatting changes. (The resulting Kepub is itself, a standard e-pub that can be properly and completely read with any epub reading software.)
That being said, it's possible that Standard E-books might be making more changes to accommodate the Kobo's quirks. For example, the Kepub engine can not properly render spacing or sizes in physical measurements, (ie, Inches, cm, or pt.) and only produces consistent results if using relative sizes, (em or %)