tk/winfo width

(tk/winfo 'width #<widget>)
Returns a decimal string giving #<widget>'s width in pixels. When a window is first created its width will be 1 pixel; the width will eventually be changed by a geometry manager to fulfill the window's needs. If you need the true width immediately after creating a widget, invoke update to force the geometry manager to arrange it, or use tk/winfo reqwidth to get the #<widget>'s requested width instead of its actual width.

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