text-scale-adjust

text-scale-adjust is an interactive autoloaded compiled Lisp function in `face-remap.el'.

It is bound to C-x C-0, C-x C-=, C-x C--, C-x C-+.

(text-scale-adjust INC)

Adjust the height of the default face by INC.

INC may be passed as a numeric prefix argument.

The actual adjustment made depends on the final component of the
key-binding used to invoke the command, with all modifiers removed:

+, = Increase the default face height by one step
- Decrease the default face height by one step
0 Reset the default face height to the global default

After adjusting, continue to read input events and further adjust
the face height as long as the input event read
(with all modifiers removed) is one of the above characters.

Each step scales the height of the default face by the variable
`text-scale-mode-step' (a negative number of steps decreases the
height by the same amount). As a special case, an argument of 0
will remove any scaling currently active.

This command is a special-purpose wrapper around the
`text-scale-increase' command which makes repetition convenient
even when it is bound in a non-top-level keymap. For binding in
a top-level keymap, `text-scale-increase' or
`text-scale-decrease' may be more appropriate.