GNU Emacs Manual. Node: Format Faces

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19.11.4: Faces in Formatted Text

The Faces submenu lists various Emacs faces including bold, italic, and underline. Selecting one of these adds the chosen face to the region. See Faces. You can also specify a face with these keyboard commands:

M-g d

Set the region, or the next inserted character, to the default face (facemenu-set-default).

M-g b Set the region, or the next inserted character, to the bold face (facemenu-set-bold).
M-g i Set the region, or the next inserted character, to the italic face (facemenu-set-italic).
M-g l Set the region, or the next inserted character, to the bold-italic face (facemenu-set-bold-italic).
M-g u Set the region, or the next inserted character, to the underline face (facemenu-set-underline).
M-g o face RET Set the region, or the next inserted character, to the face face (facemenu-set-face).

If you use these commands with a prefix argument---or, in Transient Mark mode, if the region is not active---then these commands specify a face to use for your next self-inserting input. See Transient Mark. This applies to both the keyboard commands and the menu commands.

Enriched mode defines two additional faces: excerpt and fixed. These correspond to codes used in the text/enriched file format.

The excerpt face is intended for quotations. This face is the same as italic unless you customize it (see Face Customization).

The fixed face is meant to say, ``Use a fixed-width font for this part of the text.'' Emacs currently supports only fixed-width fonts; therefore, the fixed annotation is not necessary now. However, we plan to support variable width fonts in future Emacs versions, and other systems that display text/enriched format may not use a fixed-width font as the default. So if you specifically want a certain part of the text to use a fixed-width font, you should specify the fixed face for that part.

The fixed face is normally defined to use a different font from the default. However, different systems have different fonts installed, so you may need to customize this.

If your terminal cannot display different faces, you will not be able to see them, but you can still edit documents containing faces. You can even add faces and colors to documents. They will be visible when the file is viewed on a terminal that can display them.

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