Turning borders on and off
The frameborder attribute is used to turn the 3D borders between frames on (with a value of 1) and off (0), like a toggle switch. The W3C Recommendations specify that the frameborder attribute should be used for each individual frame element, but most browsers support frameborder in the frameset element as well (see previous note). Applying a frame border to a single frame draws the border on all sides of that frame. It will look as though the neighboring frames have their borders turned on as well, even if they are turned off.
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