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The -webkit-hyphens CSS is the acknowledged way to turn hyphenation on or off in KFX. Amazon KDP itself told me this, even though they haven't publicly documented it. At present, I'm turning hyphenation OFF in the body tag and then turning it back on for specific paragraph classes. This works perfectly in KFX.
So, Amazon is certainly NOT adding soft hyphens. Given the accuracy I've seen in processed KFX books, it's probably a dictionary lookup.
Kerning and ligatures likewise can probably be controlled by CSS, but I haven't experimented with that. Like hyphenation, these too are Webkit features, not Kindle inventions.
When I said that "-webkit-hyphens" works "at least" in the Kindle Previewer with Fire emulation, I was referrring to hyphenation in KF8, which is the format that people are adding their own soft hyphens in. There's no "at least" about it in KFX. It's ALWAYS the way to do it.
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