Most Kindle books are delivered by Amazon in KFX format these days. Based on my testing with Kindle Previewer 3, in conversion to KFX hidden text and image alt text is discarded and so will be unavailable for searching or TTS.
Edit: I was wrong. I retested and found that the alt text for images is actually preserved in KFX. I do not know if it is actually used for anything.
Last edited by jhowell; 03-22-2017 at 03:26 PM.
Reason: Correction
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