Answer by user669677 for Set cellpadding and cellspacing in CSS?

Default

The default behavior of the browser is equivalent to:

table {border-collapse: collapse;}
td    {padding: 0px;}

Cellpadding

Sets the amount of space between the contents of the cell and the cell wall

table {border-collapse: collapse;}
td    {padding: 6px;}

Cellspacing

Controls the space between table cells

table {border-spacing: 2px;}
td    {padding: 0px;}

Both

table {border-spacing: 2px;}
td    {padding: 6px;}

Both (special)

table {border-spacing: 8px 2px;}
td    {padding: 6px;}

Note: If there is border-spacing set, it indicates border-collapse property of the table is separate.

Try it yourself!

Here you can find the old HTML way of achieving this.