Originally Posted by Notjohn
I keep the Preview Pane open in Sigil, a bit narrower than the Code View window in which I do all my work. (Since Preview Pane came to live with us, I've almost never used Book View.) It is, for all practical purposes, WYSIWYG and gives a true picture of what you are building. I use the built-in validator (the green check on the toolbar) regularly. It does miss a few things that Epubcheck will throw up as an error, so you might use Epubcheck online as a final validation.
I then upload the epub directly to the KDP, let it convert, and download the converted book file, which calls itself a "mobi" though it is really a great deal more than that. I then use Kindle Previewer (also my Fire HD and sometimes an e-ink Kindle) to check every possible emulation.
I've never had a validated epub fail to convert just as I hoped it would.
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