BORDERSTYLE="style" 

Sets the type of line used to draw BORDERS around an element, where style may take one of these values:

SOLID

A continuous line, a BORDERWIDTH wide.

BROKEN

A line of dashes (3xBORDERWIDTH) long spaced a BORDERWIDTH apart. Dashes are a BORDERWIDTH wide.

Synonym: DASHED.

DOTTED

A line of dots.
The dots are round or square, depending on the value of LINEJOIN or LINEEND attribute.
The diameter of round dots is equal to the BORDERWIDTH value. The square dots are a BORDERWIDTH wide/high.
The distance between one dot and the next is the BORDERWIDTH value.

COLOUR example

Links:

BORDERS

BORDERCOLOUR

BORDERWIDTH

LINEEND

LINEJOIN