Frame Geometry

The geometry of a frame depends on the toolkit that was used to build this instance of Emacs and the terminal that displays the frame. This chapter describes these dependencies and some of the functions to deal with them. Note that the frame argument of all of these functions has to specify a live frame (see Deleting Frames). If omitted or nil, it specifies the selected frame (see Input Focus).

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https://www.gnu.org/software/emacs/manual/html_node/elisp/Frame-Geometry.html