Actually,
alt can be set to "" for most images, with or without captions.
alt is supposed to be the text displayed (or read aloud) when the image is not displayed for whatever reason (because it's disabled, because the medium does not support images, you name it).
For normal illustrations, there's absolutely no need for a reader (the human kind) who does not see the images to be reminded that "an illustration of the sentence you have just read should appear here". So, for most illustrations I simply use alt="".
Some other alt text is needed when the information in the image is important for the text: a handwritten letter, a treasure map that the text then refers to (in this case, rather than "Treasure map" I'd write "Treasure map with a big X next to the third tree in the row"), a special symbol or foreign word, etc.
Quote:
Originally Posted by kerliza
For Kindle specs, even with a caption the alt field is required.
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And it is required for ePub too. But as already explained, it can be empty.