| Valid value | Description |
|---|
| none | No border; the computed border width is zero. |
| hidden | Same as 'none', except in terms of border conflict resolution for table elements. |
| dotted | A series of dots. |
| dashed | A series of short line segments. |
| solid | A single line segment. |
| double | Two solid lines. The sum of the two lines and the space between them equals the value of 'border-width'. |
| groove | The border looks as though it were carved into the canvas. |
| ridge | The opposite of 'groove': the border looks as though it were coming out of the canvas. |
| inset | The border makes the box look as though it were embedded in the canvas. |
| outset | The opposite of 'inset': the border makes the box look as though it were coming out of the canvas. |