elisp: Initial Parameters
28.4.2 Initial Frame Parameters
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You can specify the parameters for the initial startup frame by setting
‘initial-frame-alist’ in your init file (Init File).
-- User Option: initial-frame-alist
This variable’s value is an alist of parameter values used when
creating the initial frame. You can set this variable to specify
the appearance of the initial frame without altering subsequent
frames. Each element has the form:
(PARAMETER . VALUE)
Emacs creates the initial frame before it reads your init file.
After reading that file, Emacs checks ‘initial-frame-alist’, and
applies the parameter settings in the altered value to the already
created initial frame.
If these settings affect the frame geometry and appearance, you’ll
see the frame appear with the wrong ones and then change to the
specified ones. If that bothers you, you can specify the same
geometry and appearance with X resources; those do take effect
before the frame is created. X Resources (emacs)X
Resources.
X resource settings typically apply to all frames. If you want to
specify some X resources solely for the sake of the initial frame,
and you don’t want them to apply to subsequent frames, here’s how
to achieve this. Specify parameters in ‘default-frame-alist’ to
override the X resources for subsequent frames; then, to prevent
these from affecting the initial frame, specify the same parameters
in ‘initial-frame-alist’ with values that match the X resources.
If these parameters include ‘(minibuffer . nil)’, that indicates that
the initial frame should have no minibuffer. In this case, Emacs
creates a separate “minibuffer-only frame” as well.
-- User Option: minibuffer-frame-alist
This variable’s value is an alist of parameter values used when
creating an initial minibuffer-only frame (i.e., the
minibuffer-only frame that Emacs creates if ‘initial-frame-alist’
specifies a frame with no minibuffer).
-- User Option: default-frame-alist
This is an alist specifying default values of frame parameters for
all Emacs frames—the first frame, and subsequent frames. When
using the X Window System, you can get the same results by means of
X resources in many cases.
Setting this variable does not affect existing frames.
Furthermore, functions that display a buffer in a separate frame
may override the default parameters by supplying their own
parameters.
If you invoke Emacs with command-line options that specify frame
appearance, those options take effect by adding elements to either
‘initial-frame-alist’ or ‘default-frame-alist’. Options which affect
just the initial frame, such as ‘--geometry’ and ‘--maximized’, add to
‘initial-frame-alist’; the others add to ‘default-frame-alist’.
Command Line Arguments for Emacs Invocation (emacs)Emacs Invocation.