A CSS border value for the outer boundary of the weblet. For example '1px dashed red'.
Blank (no border is shown).
Any valid CSS border string. This consists of a width, a style and a color, each separated by a space. Properties can be omitted from this list but must be in this order. For example, "solid #ff0000" is valid. For more information on the CSS border property, look at the W3C specification.