dotted - A series of round dots.
dashed - A series of square-ended dashes.
solid - A single line segment.
double - Two parallel solid lines with some space between them. When using this value, the border-width value determines the sum of the lines and the space between them.
groove - Looks as if it were carved in the canvas.
ridge - Looks as if it were coming out of the canvas.
inset - Looks as if the content on the inside of the border is sunken into the canvas. Treated as ridge in the collapsing border model.
outset - Looks as if the content on the inside of the border is coming out of the canvas. Treated as groove in the collapsing border model.