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GNU Emacs Lisp Reference Manual

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29.3.1 Access to Frame Parameters

These functions let you read and change the parameter values of a frame.

Function: frame-parameter frame parameter
This function returns the value of the parameter named parameter of frame. If frame is nil, it returns the selected frame's parameter.

Function: frame-parameters frame
The function frame-parameters returns an alist listing all the parameters of frame and their values.

Function: modify-frame-parameters frame alist
This function alters the parameters of frame frame based on the elements of alist. Each element of alist has the form (parm . value), where parm is a symbol naming a parameter. If you don't mention a parameter in alist, its value doesn't change.

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