The rb element is used within a ruby element to mark the base text that is being annotated.
The use of the rb tag is optional. When omitted, the browser will usually still be able to correctly place the ruby text with its associated kanji.
- The ruby element is used with East Asian written languages in order to place pronunciation helpers adjacent to unfamiliar characters.
- The rp element is used within a ruby element to place parentheses around pronunciation helpers when true rendering of furigana are not supported by the browser.
- The rt element is used within a ruby element to place small pronunciation marks next to an East Asian language character.
- The rtc element is used within a ruby element to surround rp and rt elements when they are used semantically, rather than as a pronunciation aid.