A face is a collection of graphical attributes for displaying text: font, foreground color, background color, optional underlining, etc. Faces control how Emacs displays text in buffers, as well as other parts of the frame such as the mode line.
One way to represent a face is as a property list of attributes,
(:foreground "red" :weight bold). Such a list is called
an anonymous face. For example, you can assign an anonymous
face as the value of the
face text property, and Emacs will
display the underlying text with the specified attributes.
See Special Properties.
More commonly, a face is referred to via a face name: a Lisp
symbol associated with a set of face attributes19. Named faces are
defined using the
defface macro (see Defining Faces).
Emacs comes with several standard named faces (see Basic Faces).
Many parts of Emacs required named faces, and do not accept anonymous faces. These include the functions documented in Attribute Functions, and the variable font-lock-keywords (see Search-based Fontification). Unless otherwise stated, we will use the term face to refer only to named faces.
This function returns a non-
nil value if object is a
named face: a Lisp symbol or string which serves as a face name.
Otherwise, it returns
|• Face Attributes:||What is in a face?|
|• Defining Faces:||How to define a face.|
|• Attribute Functions:||Functions to examine and set face attributes.|
|• Displaying Faces:||How Emacs combines the faces specified for a character.|
|• Face Remapping:||Remapping faces to alternative definitions.|
|• Face Functions:||How to define and examine faces.|
|• Auto Faces:||Hook for automatic face assignment.|
|• Basic Faces:||Faces that are defined by default.|
|• Font Selection:||Finding the best available font for a face.|
|• Font Lookup:||Looking up the names of available fonts and information about them.|
|• Fontsets:||A fontset is a collection of fonts that handle a range of character sets.|
|• Low-Level Font:||Lisp representation for character display fonts.|
For backward compatibility, you can also use a string to specify a face name; that is equivalent to a Lisp symbol with the same name.