I use (add-to-list 'default-frame-alist '(fullscreen . fullheight))
for having the new frames as tall as the screen.
How can I tell emacs to make the new frames as large as one third of the screen width?
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display-pixel-width
anddisplay-pixel-height
, and just some basic division. See also an example of feature request 21415 that is built-in to Emacs 25 to specify exact pixel height/width when creating a frame: https://emacs.stackexchange.com/a/17354/2287 – lawlist Aug 10 '17 at 00:38