border-collapse
Definition
The border-collapse property specifies if table cells should have their own border, or share a common border. The screen shot below shows a table where each cell has its own border.

The screen shot below show a table where cells share a common border.

Example
table {border-collapse: collapse}
Characteristics
Possible values
collapse- Share a common border between table cells.
separate- Give each table cell its own border.
inherit- Use the same computed value as the parent element for this property.
Default value
separate
Applies to
Inherited
Yes
See also