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Defines whether table borders should be separated or collapsed.

default border-collapse: separate;

Each table cell will display its own borders.

In this example, each cell has a border-width of 4px. As a result, the border between two cells will be 8px.

border-collapse: collapse;

Adjacent table cells will merge their borders together.

The cell that appears first in the code will "win": its borders will mask those of the following cells.