These options require varying units of measurement as described above in Size . The widget command created with this widget is .frame . Often, frames exist to organize their slaves into something that can be properly packed in a larger widget. You may not see such a frame. When you see a frame, it is because of a border around it or because some of it is showing with a distinctive color.
All widgets can have borders of a few specific kinds.
But the borders can become invisible if the -borderwidth option is set to 0. When nonzero, it is given a value in screen distances as described in the previous section. When there is a border its appearance depends on the -relief option. One of the -relief alternatives will make a frame look like an unpushed button. Another will make a frame look like a pushed button.