The <rt> tag provides the translation or pronunciation in a <ruby> annotation.
This tag is placed inside the <ruby> tag.
This <rt> element contains the translation (Yes) for the Japanese text 'はい'.
<ruby>
はい
<rp>(</rp><rt>Yes</rt><rp>)</rp>
</ruby>
rt = ruby translation
Here is when <rt> support started for each browser:
 Chrome
|
5.0 | May 2010 |
 Firefox
|
38.0 | May 2015 |
 IE/Edge
|
5.5 | Jul 2000 |
 Opera
|
15.0 | May 2013 |
 Safari
|
5.0 | Jun 2010 |
