Properties such as
margin may be specified using one, two, three, or four values.
-
When one value is specified, it applies the same margin to all four sides
-
When two values are specified, the first margin applies to the top and
bottom, the second to the left and right
-
When three values are specified, the first margin applies to the top, the
second to the right and left, the third to the bottom
(mnemonic:
left,right step together)
-
When four values are specified, the margins apply to the top,
right,
bottom, and
left in
that order (clockwise) or (mnemonic TRBL)
