This property lets you change the width of one or more of the borders around an object.

If you specify only one value, all four borders are set. Two values define the top and bottom with the first, and the second then applies to the left and right. If three values are specified, the first controls the top, the second controls both left and right, while the third controls the bottom edge. When all four values are specified, they are assumed to be in the order: top, right, bottom and left.

Width values can be specified using symbolic names or pixel values. The following symbolic names are available:

• thin

• medium

• thick

This property might be used to control the border width around a frame or in fact, with style sheet controls you can control the border width around any object that can have a style associated with it.