The fonts module of CSS3 will allow native forms of emphasis, such as the boten marks used in Japanese. These are similar in use to italicisation or bolding in Latin text - neither of which work well in small font sizes for on-screen ideographic text.

Various properties are needed to specify the type of boten character to be used, and the position relative to the base text (ie. top or bottom for horizontal text, and left or right for vertical).