revision:
The <ruby> tag specifies a ruby annotation. A ruby annotation is a small extra text, attached to the main text to indicate the pronunciation or meaning of the corresponding characters. This kind of annotation is often used in Japanese publications. Use <ruby> together with <rt> and <rp>: the "ruby" element consists of one or more characters that needs an explanation/pronunciation, and an "rt" element that gives that information, and an optional "rp" element that defines what to show for browsers that do not support ruby annotations.
<ruby> . . . </ruby>
Codes:
<ruby style="margin-left: 4vw;">
漢 <rt> ㄏㄢˋ </rt>
</ruby>
Codes:
<ruby style="margin-left: 4vw;">
漢 <rp>(</rp><rt>Kan</rt><rp>)</rp>
字 <rp>(</rp><rt>ji</rt><rp>)</rp>
</ruby>