<rt> - HTML 5

The <rt> tag defines an explanation or pronunciation of characters (for East Asian typography) in a ruby annotation.
Use the <rt> tag together with the <ruby> and the 
<rp> tags: 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 not support ruby annotations.

Syntax

    <ruby>	漢 <rt> ㄏㄢˋ </rt>	</ruby>

Example

    <ruby>	漢 <rt> ㄏㄢˋ </rt>	</ruby>

Output / Return Value

Limitations

Alternatives / See Also

Reference