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117).
Shorthand Properties
Some properties can be combined into shorthand notation??”a notation that allows
us to specify values for related properties in a single declaration.
Shorthand for Box Properties
One form of shorthand notation allows us to specify values for two, three, or four
sides of a box simultaneously, like this:
margin: 1em 2em 3em 4em;
That declaration is equivalent to these:
General Syntax and
Nomenclature
The Ultimate CSS Reference 40
margin-top: 1em;
margin-right: 2em;
margin-bottom: 3em;
margin-left: 4em;
The TRouBLe Mnemonic
Note the order in which these properties occur in the shorthand notation. They
appear in a clockwise order, starting at the top: Top, Right, Bottom, Left.
Remembering this order keeps you out of TRouBLe.
This form of shorthand notation can take one, two, three, or four values. If four
values are specified, they??™re assigned to the appropriate sides in TRouBLe order. If
only two or three values are specified, the ???missing??? side is assigned the same value
as the one opposite it.


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