@chapter Customization Settings
@cindex customization item
- This chapter describes how to declare customizable variables and
-customization groups for classifying them. We use the term
-@dfn{customization item} to include customizable variables,
-customization groups, as well as faces.
-
- @xref{Defining Faces}, for the @code{defface} macro, which is used
-for declaring customizable faces.
+ Users of Emacs can customize variables and faces without writing
+Lisp code, by using the Customize interface. @xref{Easy
+Customization,,, emacs, The GNU Emacs Manual}. This chapter describes
+how to define @dfn{customization items} that users can interact with
+through the Customize interface.
+
+ Customization items include customizable variables, which are
+defined with the
+@ifinfo
+@code{defcustom} macro (@pxref{Variable Definitions});
+@end ifinfo
+@ifnotinfo
+@code{defcustom} macro;
+@end ifnotinfo
+customizable faces, which are defined with @code{defface} (described
+separately in @ref{Defining Faces}); and @dfn{customization groups},
+defined with
+@ifinfo
+@code{defgroup} (@pxref{Group Definitions}),
+@end ifinfo
+@ifnotinfo
+@code{defgroup},
+@end ifnotinfo
+which act as containers for groups of related customization items.
@menu
* Common Keywords:: Common keyword arguments for all kinds of
@cindex customization keywords
The customization declarations that we will describe in the next few
-sections (@code{defcustom}, @code{defgroup}, etc.) all accept keyword
-arguments for specifying various information. This section describes
-keywords that apply to all types of customization declarations.
+sections---@code{defcustom}, @code{defgroup}, etc.---all accept
+keyword arguments (@pxref{Constant Variables}) for specifying various
+information. This section describes keywords that apply to all types
+of customization declarations.
All of these keywords, except @code{:tag}, can be used more than once
in a given item. Each use of the keyword has an independent effect.
@cindex define customization group
@cindex customization groups, defining
- Each Emacs Lisp package should have one main customization group which
-contains all the options, faces and other groups in the package. If the
-package has a small number of options and faces, use just one group and
-put everything in it. When there are more than twelve or so options and
-faces, then you should structure them into subgroups, and put the
-subgroups under the package's main customization group. It is OK to
-put some of the options and faces in the package's main group alongside
-the subgroups.
+ Each Emacs Lisp package should have one main customization group
+which contains all the options, faces and other groups in the package.
+If the package has a small number of options and faces, use just one
+group and put everything in it. When there are more than twenty or so
+options and faces, then you should structure them into subgroups, and
+put the subgroups under the package's main customization group. It is
+OK to put some of the options and faces in the package's main group
+alongside the subgroups.
The package's main or only group should be a member of one or more of
the standard customization groups. (To display the full list of them,
@node Variable Definitions
@section Defining Customization Variables
@cindex define customization options
-@cindex customization variables, how to define
+@cindex customizable variables, how to define
+@cindex user options, how to define
+
+ @dfn{Customizable variables}, also called @dfn{user options}, are
+global Lisp variables whose values can be set through the Customize
+interface. Unlike other global variables, which are defined with
+@code{defvar} (@pxref{Defining Variables}), customizable variables are
+defined using the @code{defcustom} macro. In addition to calling
+@code{defvar} as a subroutine, @code{defcustom} states how the
+variable should be displayed in the Customize interface, the values it
+is allowed to take, etc.
@defmac defcustom option standard doc [keyword value]@dots{}
This macro declares @var{option} as a user option (i.e.@: a
standard value after Emacs starts up.
@end defmac
- @code{defcustom} accepts the following additional keywords:
+ In addition to the keywords listed in @ref{Common Keywords}, this
+macro accepts the following keywords:
@table @code
@item :type @var{type}
Use @var{type} as the data type for this option. It specifies which
-values are legitimate, and how to display the value.
-@xref{Customization Types}, for more information.
+values are legitimate, and how to display the value
+(@pxref{Customization Types}).
@item :options @var{value-list}
@kindex options@r{, @code{defcustom} keyword}
A @dfn{face} is a collection of graphical @dfn{attributes} for
displaying text: font, foreground color, background color, optional
-underlining, and so on. Faces control how Emacs displays text in
-buffers, as well as other parts of the frame such as the mode line.
-@xref{Standard Faces,,, emacs, The GNU Emacs Manual}, for the list of
-faces Emacs normally comes with.
-
-@cindex face id
- For most purposes, you refer to a face in Lisp programs using its
-@dfn{face name}, which is usually a Lisp symbol. For backward
-compatibility, a face name can also be a string, which is equivalent
-to a Lisp symbol of the same name.
+underlining, etc. Faces control how Emacs displays text in buffers,
+as well as other parts of the frame such as the mode line.
+
+@cindex anonymous face
+ One way to represent a face is as a property list of attributes,
+like @code{(:foreground "red" :weight bold)}. For example, you can
+assign such an @dfn{anonymous face} as the value of the @code{face}
+text property; this causes Emacs to display the underlying text with
+the specified attributes. @xref{Special Properties}.
+
+@cindex face name
+ More commonly, a face is referred to via a @dfn{face name}: a Lisp
+symbol which is associated with a set of face attributes. Named faces
+are defined using the @code{defface} macro (@pxref{Defining Faces}).
+Emacs defines several standard named faces; @xref{Standard Faces,,,
+emacs, The GNU Emacs Manual}.
+
+ Many parts of Emacs require named faces, and do not accept anonymous
+faces. These include the functions documented in @ref{Attribute
+Functions}, and the variable @code{font-lock-keywords}
+(@pxref{Search-based Fontification}). Unless otherwise stated, we
+will use the term @dfn{face} to refer only to named faces.
+
+ 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.
@defun facep object
-This function returns a non-@code{nil} value if @var{object} is a Lisp
-symbol or string that names a face. Otherwise, it returns @code{nil}.
+This function returns a non-@code{nil} value if @var{object} is a
+named face: a Lisp symbol or string which serves as a face name.
+Otherwise, it returns @code{nil}.
@end defun
By default, each face name corresponds to the same set of attributes
attributes in one frame (@pxref{Attribute Functions}).
@menu
-* Defining Faces:: How to define a face.
* 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.
* Low-Level Font:: Lisp representation for character display fonts.
@end menu
-@node Defining Faces
-@subsection Defining Faces
-
- The @code{defface} macro defines a face and specifies its default
-appearance. The user can subsequently customize the face using the
-Customize interface (@pxref{Customization}).
-
-@defmac defface face spec doc [keyword value]@dots{}
-This macro declares @var{face} as a customizable face whose default
-attributes are given by @var{spec}. You should not quote the symbol
-@var{face}, and it should not end in @samp{-face} (that would be
-redundant). The argument @var{doc} is a documentation string for the
-face. The additional @var{keyword} arguments have the same meanings
-as in @code{defgroup} and @code{defcustom} (@pxref{Common Keywords}).
-
-When @code{defface} executes, it defines the face according to
-@var{spec}, then uses any customizations that were read from the
-init file (@pxref{Init File}) to override that specification.
-
-When you evaluate a @code{defface} form with @kbd{C-M-x} in Emacs
-Lisp mode (@code{eval-defun}), a special feature of @code{eval-defun}
-overrides any customizations of the face. This way, the face reflects
-exactly what the @code{defface} says.
-
-@cindex face specification
-The @var{spec} argument is a @dfn{face specification}, which states
-how the face should appear on different kinds of terminals. It should
-be an alist whose elements each have the form
-
-@example
-(@var{display} . @var{plist})
-@end example
-
-@noindent
-@var{display} specifies a class of terminals (see below), while
-@var{plist} is a property list of face attributes and their values,
-specifying how the face appears on such terminals
-@iftex
-(see the next section for details about face attributes).
-@end iftex
-@ifnottex
-(@pxref{Face Attributes}, for details about face attributes).
-@end ifnottex
-
-The @var{display} part of an element of @var{spec} determines which
-frames the element matches. If more than one element of @var{spec}
-matches a given frame, the first element that matches is the one used
-for that frame. There are three possibilities for @var{display}:
-
-@table @asis
-@item @code{default}
-This element of @var{spec} doesn't match any frames; instead, it
-specifies defaults that apply to all frames. This element, if used,
-must be the first element of @var{spec}. Each of the following
-elements can override any or all of these defaults.
-
-@item @code{t}
-This element of @var{spec} matches all frames. Therefore, any
-subsequent elements of @var{spec} are never used. Normally
-@code{t} is used in the last (or only) element of @var{spec}.
-
-@item a list
-If @var{display} is a list, each element should have the form
-@code{(@var{characteristic} @var{value}@dots{})}. Here
-@var{characteristic} specifies a way of classifying frames, and the
-@var{value}s are possible classifications which @var{display} should
-apply to. Here are the possible values of @var{characteristic}:
-
-@table @code
-@item type
-The kind of window system the frame uses---either @code{graphic} (any
-graphics-capable display), @code{x}, @code{pc} (for the MS-DOS console),
-@code{w32} (for MS Windows 9X/NT/2K/XP), or @code{tty}
-(a non-graphics-capable display).
-@xref{Window Systems, window-system}.
-
-@item class
-What kinds of colors the frame supports---either @code{color},
-@code{grayscale}, or @code{mono}.
-
-@item background
-The kind of background---either @code{light} or @code{dark}.
-
-@item min-colors
-An integer that represents the minimum number of colors the frame
-should support. This matches a frame if its
-@code{display-color-cells} value is at least the specified integer.
-
-@item supports
-Whether or not the frame can display the face attributes given in
-@var{value}@dots{} (@pxref{Face Attributes}). @xref{Display Face
-Attribute Testing}, for more information on exactly how this testing
-is done.
-@end table
-
-If an element of @var{display} specifies more than one @var{value} for a
-given @var{characteristic}, any of those values is acceptable. If
-@var{display} has more than one element, each element should specify a
-different @var{characteristic}; then @emph{each} characteristic of the
-frame must match one of the @var{value}s specified for it in
-@var{display}.
-@end table
-@end defmac
-
- Here's how the standard face @code{highlight} is defined:
-
-@example
-(defface highlight
- '((((class color) (min-colors 88) (background light))
- :background "darkseagreen2")
- (((class color) (min-colors 88) (background dark))
- :background "darkolivegreen")
- (((class color) (min-colors 16) (background light))
- :background "darkseagreen2")
- (((class color) (min-colors 16) (background dark))
- :background "darkolivegreen")
- (((class color) (min-colors 8))
- :background "green" :foreground "black")
- (t :inverse-video t))
- "Basic face for highlighting."
- :group 'basic-faces)
-@end example
-
- Internally, Emacs stores the face's default specification in its
-@code{face-defface-spec} symbol property (@pxref{Property Lists}).
-The @code{saved-face} property stores the face specification saved by
-the user, using the customization buffer; the @code{customized-face}
-property stores the face specification customized for the current
-session, but not saved; and the @code{theme-face} property stores an
-alist associating the active customization settings and Custom themes
-with their specifications for that face. The face's documentation
-string is stored in the @code{face-documentation} property. But
-normally you should not try to set any of these properties directly.
-@xref{Applying Customizations}, for the @code{custom-set-faces}
-function, which is used to apply customized face settings.
-
- People are sometimes tempted to create variables whose values
-specify a face to use. In the vast majority of cases, this is not
-necessary; it is preferable to simply use faces directly.
-
@node Face Attributes
@subsection Face Attributes
@cindex face attributes
- The effect of using a face is determined by a fixed set of @dfn{face
-attributes}. This table lists all the face attributes, their possible
-values, and their effects. You can specify more than one face for a
-given piece of text; Emacs merges the attributes of all the faces to
-determine how to display the text. @xref{Displaying Faces}.
+ @dfn{Face attributes} determine the visual appearance of a face.
+The following table lists all the face attributes, their possible
+values, and their effects.
- In addition to the values given below, each face attribute can also
-have the value @code{unspecified}. This special value means the face
-doesn't specify that attribute. In face merging, when the first face
-fails to specify a particular attribute, the next face gets a chance.
-However, the @code{default} face must specify all attributes.
+ Apart from the values given below, each face attribute can have the
+value @code{unspecified}. This special value means that the face
+doesn't specify that attribute directly. An @code{unspecified}
+attribute tells Emacs to refer instead to a parent face (see the
+description @code{:inherit} attribute below); or, failing that, to an
+underlying face (@pxref{Displaying Faces}). The @code{default} face
+must specify all attributes.
Some of these attributes are meaningful only on certain kinds of
displays. If your display cannot handle a certain attribute, the
@table @code
@item :family
Font family or fontset (a string). @xref{Fonts,,, emacs, The GNU
-Emacs Manual}, for more information about font families; the function
+Emacs Manual}, for more information about font families. The function
@code{font-family-list} (see below) returns a list of available family
names. @xref{Fontsets}, for information about fontsets.
units of 1/10 point.
The value can also be a floating point number or a function, which
-specifies the height relative to an @dfn{underlying face} (i.e., a
-face that has a lower priority in the list described in
-@ref{Displaying Faces}). If the value is a floating point number,
+specifies the height relative to an @dfn{underlying face}
+(@pxref{Displaying Faces}). If the value is a floating point number,
that specifies the amount by which to scale the height of the
underlying face. If the value is a function, that function is called
with one argument, the height of the underlying face, and returns the
@code{nil} otherwise.
@end defun
+@node Defining Faces
+@subsection Defining Faces
+
+ The usual way to define a face is through the @code{defface} macro.
+This macro defines a face name, and associates that name with a set of
+face attributes. It also sets up the face so that the user can
+customize it via the Customize interface (@pxref{Customization}).
+
+@defmac defface face spec doc [keyword value]@dots{}
+This macro declares @var{face} as a customizable face whose default
+attributes are given by @var{spec}. You should not quote the symbol
+@var{face}, and it should not end in @samp{-face} (that would be
+redundant). The argument @var{doc} is a documentation string for the
+face. The additional @var{keyword} arguments have the same meanings
+as in @code{defgroup} and @code{defcustom} (@pxref{Common Keywords}).
+
+When @code{defface} executes, it defines the face according to
+@var{spec}, then uses any customizations that were read from the
+init file (@pxref{Init File}) to override that specification.
+
+When you evaluate a @code{defface} form with @kbd{C-M-x} in Emacs
+Lisp mode (@code{eval-defun}), a special feature of @code{eval-defun}
+overrides any customizations of the face. This way, the face reflects
+exactly what the @code{defface} says.
+
+@cindex face specification
+The @var{spec} argument is a @dfn{face specification}, which states
+how the face should appear on different kinds of terminals. It should
+be an alist whose elements each have the form
+
+@example
+(@var{display} . @var{plist})
+@end example
+
+@noindent
+@var{display} specifies a class of terminals (see below). @var{plist}
+is a property list of face attributes and their values, specifying how
+the face appears on such terminals. For backward compatibility, you
+can also write an element as @code{(@var{display} @var{plist})}.
+
+The @var{display} part of an element of @var{spec} determines which
+terminals the element matches. If more than one element of @var{spec}
+matches a given terminal, the first element that matches is the one
+used for that terminal. There are three possibilities for
+@var{display}:
+
+@table @asis
+@item @code{default}
+This element of @var{spec} doesn't match any terminal; instead, it
+specifies defaults that apply to all terminals. This element, if
+used, must be the first element of @var{spec}. Each of the following
+elements can override any or all of these defaults.
+
+@item @code{t}
+This element of @var{spec} matches all terminals. Therefore, any
+subsequent elements of @var{spec} are never used. Normally @code{t}
+is used in the last (or only) element of @var{spec}.
+
+@item a list
+If @var{display} is a list, each element should have the form
+@code{(@var{characteristic} @var{value}@dots{})}. Here
+@var{characteristic} specifies a way of classifying terminals, and the
+@var{value}s are possible classifications which @var{display} should
+apply to. Here are the possible values of @var{characteristic}:
+
+@table @code
+@item type
+The kind of window system the terminal uses---either @code{graphic}
+(any graphics-capable display), @code{x}, @code{pc} (for the MS-DOS
+console), @code{w32} (for MS Windows 9X/NT/2K/XP), or @code{tty} (a
+non-graphics-capable display). @xref{Window Systems, window-system}.
+
+@item class
+What kinds of colors the terminal supports---either @code{color},
+@code{grayscale}, or @code{mono}.
+
+@item background
+The kind of background---either @code{light} or @code{dark}.
+
+@item min-colors
+An integer that represents the minimum number of colors the terminal
+should support. This matches a terminal if its
+@code{display-color-cells} value is at least the specified integer.
+
+@item supports
+Whether or not the terminal can display the face attributes given in
+@var{value}@dots{} (@pxref{Face Attributes}). @xref{Display Face
+Attribute Testing}, for more information on exactly how this testing
+is done.
+@end table
+
+If an element of @var{display} specifies more than one @var{value} for
+a given @var{characteristic}, any of those values is acceptable. If
+@var{display} has more than one element, each element should specify a
+different @var{characteristic}; then @emph{each} characteristic of the
+terminal must match one of the @var{value}s specified for it in
+@var{display}.
+@end table
+@end defmac
+
+ Here's how the standard face @code{highlight} is defined:
+
+@example
+(defface highlight
+ '((((class color) (min-colors 88) (background light))
+ :background "darkseagreen2")
+ (((class color) (min-colors 88) (background dark))
+ :background "darkolivegreen")
+ (((class color) (min-colors 16) (background light))
+ :background "darkseagreen2")
+ (((class color) (min-colors 16) (background dark))
+ :background "darkolivegreen")
+ (((class color) (min-colors 8))
+ :background "green" :foreground "black")
+ (t :inverse-video t))
+ "Basic face for highlighting."
+ :group 'basic-faces)
+@end example
+
+ Internally, Emacs stores the face's default specification in its
+@code{face-defface-spec} symbol property (@pxref{Property Lists}).
+The @code{saved-face} property stores the face specification saved by
+the user, using the customization buffer; the @code{customized-face}
+property stores the face specification customized for the current
+session, but not saved; and the @code{theme-face} property stores an
+alist associating the active customization settings and Custom themes
+with their specifications for that face. The face's documentation
+string is stored in the @code{face-documentation} property. But
+normally you should not try to set any of these properties directly.
+@xref{Applying Customizations}, for the @code{custom-set-faces}
+function, which is used to apply customized face settings.
+
+ People are sometimes tempted to create variables whose values
+specify a face to use. In the vast majority of cases, this is not
+necessary; it is preferable to simply use faces directly.
+
@node Attribute Functions
@subsection Face Attribute Functions
This section describes the functions for accessing and modifying the
-attributes of an existing face.
+attributes of an existing named face.
@defun set-face-attribute face frame &rest arguments
This function sets one or more attributes of @var{face} for
@node Displaying Faces
@subsection Displaying Faces
- Here is how Emacs determines the face to use for displaying any
-given piece of text:
+ When Emacs displays a given piece of text, the visual appearance of
+the text may be determined by faces drawn from different sources. If
+these various sources together specify more than one face for a
+particular character, Emacs merges the attributes of the various
+faces. Here is the order in which Emacs merges the faces, from
+highest to lowest priority:
@itemize @bullet
@item
@item
If the text lies within an overlay with a non-@code{nil} @code{face}
-property, Emacs applies the face or face attributes specified by that
-property. If the overlay has a @code{mouse-face} property and the
-mouse is ``near enough'' to the overlay, Emacs applies the face or
-face attributes specified by the @code{mouse-face} property instead.
-@xref{Overlay Properties}.
+property, Emacs applies the face(s) specified by that property. If
+the overlay has a @code{mouse-face} property and the mouse is ``near
+enough'' to the overlay, Emacs applies the face or face attributes
+specified by the @code{mouse-face} property instead. @xref{Overlay
+Properties}.
When multiple overlays cover one character, an overlay with higher
priority overrides those with lower priority. @xref{Overlays}.
steps, Emacs applies the attribute of the @code{default} face.
@end itemize
- If these various sources together specify more than one face for a
-particular character, Emacs merges the attributes of the various faces
-specified. For each attribute, Emacs tries using the above order
-(i.e.@: first the face of any special glyph; then the face for region
-highlighting, if appropriate; and so on).
+ At each stage, if a face has a valid @code{:inherit} attribute,
+Emacs treats any attribute with an @code{unspecified} value as having
+the corresponding value drawn from the parent face(s). @pxref{Face
+Attributes}. Note that the parent face(s) may also leave the
+attribute unspecified; in that case, the attribute remains unspecified
+at the next level of face merging.
@node Face Remapping
@subsection Face Remapping
Third argument DOC is the face documentation.
-If FACE has been set with `custom-set-faces', set the face attributes
-as specified by that function, otherwise set the face attributes
-according to SPEC.
-
-The remaining arguments should have the form
-
- [KEYWORD VALUE]...
+If FACE has been set with `custom-set-faces', set the face
+attributes as specified by that function, otherwise set the face
+attributes according to SPEC.
+The remaining arguments should have the form [KEYWORD VALUE]...
For a list of valid keywords, see the common keywords listed in
`defcustom'.
-SPEC should be an alist of the form ((DISPLAY ATTS)...).
-
-In the first element, DISPLAY can be `default'. The ATTS in that
-element then act as defaults for all the following elements.
-
-Aside from that, DISPLAY specifies conditions to match some or
-all frames. For each frame, the first element of SPEC where the
-DISPLAY conditions are satisfied is the one that applies to that
-frame. The ATTRs in this element take effect, and the following
-elements are ignored, on that frame.
-
-In the last element, DISPLAY can be t. That element applies to a
-frame if none of the previous elements (except the `default' if
-any) did.
-
-ATTS is a list of face attributes followed by their values:
- (ATTR VALUE ATTR VALUE...)
-
-The possible attributes are `:family', `:width', `:height', `:weight',
-`:slant', `:underline', `:overline', `:strike-through', `:box',
-`:foreground', `:background', `:stipple', `:inverse-video', and `:inherit'.
-
-DISPLAY can be `default' (only in the first element), the symbol
-t (only in the last element) to match all frames, or an alist of
-conditions of the form \(REQ ITEM...). For such an alist to
-match a frame, each of the conditions must be satisfied, meaning
-that the REQ property of the frame must match one of the
-corresponding ITEMs. These are the defined REQ values:
-
-`type' (the value of `window-system')
- Under X, in addition to the values `window-system' can take,
- `motif', `lucid', `gtk' and `x-toolkit' are allowed, and match when
- the Motif toolkit, Lucid toolkit, GTK toolkit or any X toolkit is in use.
-
-`class' (the frame's color support)
- Should be one of `color', `grayscale', or `mono'.
-
-`background' (what color is used for the background text)
- Should be one of `light' or `dark'.
-
-`min-colors' (the minimum number of colors the frame should support)
- Should be an integer, it is compared with the result of
- `display-color-cells'.
-
-`supports' (only match frames that support the specified face attributes)
- Should be a list of face attributes. See the documentation for
- the function `display-supports-face-attributes-p' for more
- information on exactly how testing is done.
-
-See Info node `(elisp) Customization' in the Emacs Lisp manual
-for more information."
+SPEC should be an alist of the form
+
+ ((DISPLAY . ATTS)...)
+
+where DISPLAY is a form specifying conditions to match certain
+terminals and ATTS is a property list (ATTR VALUE ATTR VALUE...)
+specifying face attributes and values for frames on those
+terminals. On each terminal, the first element with a matching
+DISPLAY specification takes effect, and the remaining elements in
+SPEC are disregarded.
+
+As a special exception, in the first element of SPEC, DISPLAY can
+be the special value `default'. Then the ATTS in that element
+act as defaults for all the following elements.
+
+For backward compatibility, elements of SPEC can be written
+as (DISPLAY ATTS) instead of (DISPLAY . ATTS).
+
+Each DISPLAY can have the following values:
+ - `default' (only in the first element).
+ - The symbol t, which matches all terminals.
+ - An alist of conditions. Each alist element must have the form
+ (REQ ITEM...). A matching terminal must satisfy each
+ specified condition by matching one of its ITEMs. Each REQ
+ must be one of the following:
+ - `type' (the terminal type).
+ Each ITEM must be one of the values returned by
+ `window-system'. Under X, additional allowed values are
+ `motif', `lucid', `gtk' and `x-toolkit'.
+ - `class' (the terminal's color support).
+ Each ITEM should be one of `color', `grayscale', or `mono'.
+ - `background' (what color is used for the background text)
+ Each ITEM should be one of `light' or `dark'.
+ - `min-colors' (the minimum number of supported colors)
+ Each ITEM should be an integer, which is compared with the
+ result of `display-color-cells'.
+ - `supports' (match terminals supporting certain attributes).
+ Each ITEM should be a list of face attributes. See
+ `display-supports-face-attributes-p' for more information on
+ exactly how testing is done.
+
+In the ATTS property list, possible attributes are `:family',
+`:width', `:height', `:weight', `:slant', `:underline',
+`:overline', `:strike-through', `:box', `:foreground',
+`:background', `:stipple', `:inverse-video', and `:inherit'.
+
+See Info node `(elisp) Faces' in the Emacs Lisp manual for more
+information."
(declare (doc-string 3))
;; It is better not to use backquote in this file,
;; because that makes a bootstrapping problem
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