ADE = Adobe Digital Editions. Adobe's (buggy) desktop reading software, the mobile version is used in most major ePub readers (except iBooks, Apple created their own buggy software). Sigil's rendering engine is more forgiving of CSS errors than ADE (and displays things differently), so you need to test in other software to insure compatibility.
Quote:
One other stupid question
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There is no such thing as a stupid question

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