Frame parameters specify frame sizes in character units. On
graphical displays, the
default face determines the actual
pixel sizes of these character units (see Face Attributes).
The height of the frame’s text area (see Frame Geometry), in characters.
The width of the frame’s text area (see Frame Geometry), in characters.
This does for the size parameters
user-position parameter (see user-position) does for the position parameters
This parameter specifies whether to maximize the frame’s width, height
or both. Its value can be
maximized. A fullwidth frame is as
wide as possible, a fullheight frame is as tall as possible, and
a fullboth frame is both as wide and as tall as possible. A
maximized frame is like a “fullboth” frame, except that it usually
keeps its title bar and the buttons for resizing
and closing the frame. Also, maximized frames typically avoid hiding
any task bar or panels displayed on the desktop. A “fullboth” frame,
on the other hand, usually omits the title bar and occupies the entire
available screen space.
Full-height and full-width frames are more similar to maximized frames in this regard. However, these typically display an external border which might be absent with maximized frames. Hence the heights of maximized and full-height frames and the widths of maximized and full-width frames often differ by a few pixels.
With some window managers you may have to customize the variable
frame-resize-pixelwise (see Size and Position) in order to
make a frame truly appear maximized or full-screen. Moreover,
some window managers might not support smooth transition between the
various full-screen or maximization states. Customizing the variable
x-frame-normalize-before-maximize can help to overcome that.
This parameter specifies the desired fullscreen state of the frame
after invoking the
toggle-frame-fullscreen command (see Frame
Commands in The GNU Emacs Manual) in the “fullboth” state.
Normally this parameter is installed automatically by that command when
toggling the state to fullboth. If, however, you start Emacs in the
“fullboth” state, you have to specify the desired behavior in your initial
file as, for example
(setq default-frame-alist '((fullscreen . fullboth) (fullscreen-restore . fullheight)))
This will give a new frame full height after typing in it F11 for the first time.