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Ruby tags apply to other scripts as well like Japanese and Korean. See https://www.w3.org/TR/css-ruby-1/.

Sure but I saw it used for Chinese in the article. Very cool!

I use them whenever I have an excuse!

can they be applied to any text? might be useful if you have a hard to pronounce english word

I’ve used them on Latin before.

Yes, <ruby> works with arbitrary text. There are quite a few styling options too: