@poxalew: As far as I know 4 years ago, WebKit had no support for hyphenation. (calibre's viewer -- which also uses an old version of webkit -- gets hyphenation support via a javascript library). So that would imply that either Amazon is
1) Modifying webkit in which case they would have to open source their modifications
2) Using a javascript library -- which would be very slow, especially on a mobile device
3) Pre-rendering the soft hyphens in KFX which AaronShep's evidence seems to make unlikely
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