Rp

The HTML   element, or ruby parentheses, was introduced in HTML5. It is used in  elements to define what to show browsers that do not support the   element. This element was not designed to be used in Complex Ruby authoring situations. The  element was meant to be a simple fallback mechanism, and it is not suited to the complexity of the Complex Ruby usage scenario.

Attributes
See Global HTML Attributes and Standard HTML5 Attributes.
 * Global Attributes

HTML example:

漢 (ㄏㄢˋ)