On: <i>: The Idiomatic Text element

[Animats]

What does <i> do for Han characters?

I read the spec, but there's not much of a hint there.

[est → Animats]

You mean Chinese characters? Probably nothing.

> idiomatic text, technical terms, taxonomical designations

These were usually put in quotation marks.

For book titles, wrap them inside 《 》

[Animats → est]

> Chinese characters

In Unicode, Chinese, Japanese, and even Korean and Vietnamese characters are combined into something called "CJK Unified Ideographs",or just "Han".[1][2]. So they all get the same treatment for something such as italics. Not sure what HTML currently specifies for that.

[1] https://www.unicode.org/reports/tr38

[2] https://en.wikipedia.org/wiki/Han_unification