I was looking at how to include furigana (ruby) in my book for the Paperwhite and just noticed this in the official Amazon Kindle Publishing Guidelines:
Quote:
Support for Chinese, Japanese, and Korean Text
The Kindle family of devices has limited support for Chinese, Japanese, and Korean text. The Kindle
Readers for e Ink devices and applications can render horizontal left to right Chinese, Japanese, and
Korean text. They have limited font support for the CJK characters. There is no support for right to left
vertical scripts and no support for Japanese Ruby script.
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This might explain what you're seeing in the Previewer.