border-style property sets the style of an element's border.
This property can have from one to four values (for every side of the element one value.)
border-style: dotted solid double dashed;
border-style can also have the values
hidden. They have the same effect, except
hidden works for border conflict resolution for
<table> elements. In a
<table> with multiple borders,
none has the lowest priority (meaning in a conflict, the border would show), and
hidden has the highest priority (meaning in a conflict, the border would not show).