I don't know if it's just a bug but using the <ruby> tag makes the "ruby base" character invisible for "Kindle Paperwhite" mode for the Kindle Previewer 2.71 which is why I'm looking for an alternative.
No problem with the display of the <ruby> for Kindle Fire but unfortunately I need it for "Kindle Paperwhite" since it's the only one to support Japanese "vertical" writing at the moment.
Here's a screenie of the output display of the <ruby> tag (in red) for KindleFire vs KindlePaperwhite.
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