CSS Text Decoration is a module of CSS that defines features relating to text decoration, such as underlines, text shadows, and emphasis marks.
The text-emphasis CSS property is a shorthand property for setting text-emphasis-style and text-emphasis-color in one declaration. This property will apply the specified emphasis mark to each character of the element's text, except separator characters, like spaces,  and control characters.
The text-emphasis-color CSS property defines the color used to draw an emphasis mark. It can also be set, and reset, using the text-emphasis shorthand.
The text-emphasis-position CSS property describes where emphasis marks are drawn at. The effect of emphasis marks on the line height is the same as for ruby text: if there isn't enough place, the line height is increased.
The text-emphasis-style CSS property defines the type of emphasis used. It can also be set, and reset, using the text-emphasis shorthand.