Quote:
Originally Posted by zoldier
I loaded calibre converted .mobi in two Kindle devices (old one and paperwhite bought last year) and both devices rendered it as I expected and how it looks like on Kindle previewer.
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I agree with what Hitch wrote. There have been more than a dozen e-ink Kindle models going back to 2007, each of which has multiple firmware versions that can be running on it. There is no way that you could have done enough testing to say that the calibre conversion works on all (or even most) "old" Kindle devices.
ETA: I think that you should learn to live with the fact that your exact desired formatting will not be present on every single kindle device. Even on devices where your formatting works it can be broken just by setting a very large font size.
The older kindle devices that can handle only the original MOBI format are a shrinking minority. As long as the formatting is good enough to be easily readable on those devices I don't see any compelling reason to put more effort into supporting them.