I had not previously heard of ruby annotations
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<rp> Used for the benefit of browsers that don't support ruby annotations
<rt> Specifies the ruby text component of a ruby annotation.
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From
Wikipedia
Quote:
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Ruby characters (ルビ?) are small, annotative glosses that can be placed above or to the right of a Chinese character when writing languages with logographic characters such as Chinese or Japanese to show the pronunciation.
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This suggests that Amazon is serious about Eastern Asia as a market for ebooks.