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-widthanddisplay-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: emacs.stackexchange.com/a/17354/2287