How to code furigana (ruby) for mobi / Paperwhite
I'm writing a Japanese book and am wondering how to add furigana (ruby) for the Kindle Paperwhite?
I know it can be done because I have some Japanese book with furigana. However I read the Amazon Kindle Publishing Guidelines clearly say it is not possible:
"There is no support for right to left vertical scripts and no support for Japanese Ruby script." (p. 11)
The guidelines are obviously wrong but I couldn't find anything in the mobi documentation either about furigana/ruby support.