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@mattmc: My deduction that KFX is device specific is simply from data in this thread. Namely:
1) Images are grayscaled for e-ink screens
2) Images are re-compressed using a higher compression ratio (JPEG XR)
3) Since amazon has only enabled "advanced" typography for this format, it stands to reason that there is some pre-processing done to make those features easier to implement. For instance, adding soft-hyphens to the text, to avoid the layout engine on the Kindle from having to do that at runtime.
It is unlikely in my opinion that the HTML/CSS is simply copied unchanged from azw3 to kfx. Of course this cannot be known for certain unless the obfuscation is broken.
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