All categories in font tab

Font Color:

font color is the selected text is font color. user can choose different types of colors. If user chooses Automatic, Microsoft Windows apply default color that color is black. Your choice appears in the Preview box .

Underline style: 

where selected text is underlined  and the underline style. if you want to remove underline Click none to remove underlining.

Underline color:  Specifies where you want to color of the underline. This option is help unavailable if you apply an underline style. if you remove underline color also remove.