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Shorthand properties - CSS: Cascading Style Sheets

Shorthand properties are CSS properties that let you set the values of multiple other CSS properties simultaneously. Using a shorthand property, you can write more concise (and often more readable) style sheets, saving time and energy.

The CSS specification defines shorthand properties to group the definition of common properties acting on the same theme. For instance, the CSS background property is a shorthand property that's able to define the values of background-color, background-image, background-repeat, and background-position. Similarly, the most common font-related properties can be defined using the shorthand font, and the different margins around a box can be defined using the margin shorthand.

There are a few edge cases to keep in mind when using shorthand properties.

A value which is not specified is set to its initial value. That means that it overrides previously set values. For example:

p {
  background-color: red;
  background: url(images/bg.gif) no-repeat left top;
}

This will not set the color of the background to red but to the default value for background-color, which is transparent.

Only the individual properties values can inherit. As missing values are replaced by their initial value, it is impossible to allow inheritance of individual properties by omitting them. The keyword inherit can be applied to a property, but only as a whole, not as a keyword for one value or another. That means that the only way to make some specific value to be inherited is to use the longhand property with the keyword inherit.

Shorthand properties try not to force a specific order for the values of the properties they replace. This works well when these properties use values of different types, as the order has no importance, but this does not work as easily when several properties can have identical values.

Two important cases here are:

• properties related to the edges of a box, like border-style, margin or padding
• properties related to the corners of a box, like border-radius

Shorthands handling properties related to edges of a box, like border-style, margin or padding, always use a consistent 1-to-4-value syntax representing those edges:

• 1-value syntax: border-width: 1em — The single value represents all edges:

• 2-value syntax: border-width: 1em 2em — The first value represents the vertical, that is top and bottom, edges, the second the horizontal ones, that is the left and right ones:

• 3-value syntax: border-width: 1em 2em 3em — The first value represents the top edge, the second, the horizontal, that is left and right, ones, and the third value the bottom edge:

• 4-value syntax: border-width: 1em 2em 3em 4em — The four values represent the top, right, bottom and left edges respectively, always in that order, that is clock-wise starting at the top: The initial letter of Top-Right-Bottom-Left matches the order of the consonant of the word trouble: TRBL. You can also remember it as the order that the hands would rotate on a clock: 1em starts in the 12 o'clock position, then 2em in the 3 o'clock position, then 3em in the 6 o'clock position, and 4em in the 9 o'clock position.

Similarly, shorthands handling properties related to corners of a box, like border-radius, always use a consistent 1-to-4-value syntax representing those corners:

• 1-value syntax: border-radius: 1em — The single value represents all corners:

• 2-value syntax: border-radius: 1em 2em — The first value represents the top left and bottom right corner, the second the top right and bottom left ones:

• 3-value syntax: border-radius: 1em 2em 3em — The first value represents the top left corner, the second the top right and bottom left ones, and the third value the bottom right corner:

• 4-value syntax: border-radius: 1em 2em 3em 4em — The four values represent the top left, top right, bottom right and bottom left corners respectively, always in that order, that is clock-wise starting at the top left:

Consider a background with the following properties

background-color: #000;
background-image: url(images/bg.gif);
background-repeat: no-repeat;
background-position: left top;

These four declarations can be shortened to just one:

background: #000 url(images/bg.gif) no-repeat left top;

(The shorthand form is actually the equivalent of the longhand properties above plus background-attachment: scroll and, in CSS3, some additional properties.)

See background for more detailed information, including CSS3 properties.

Consider the following declarations:

font-style: italic;
font-weight: bold;
font-size: 0.8em;
line-height: 1.2;
font-family: Arial, sans-serif;

These 5 statements can be shortened to the following:

font:
  italic bold 0.8em/1.2 Arial,
  sans-serif;

This shorthand declaration is actually equivalent to the longhand declarations above plus font-variant: normal, font-size-adjust: none, and font-stretch: normal.

With borders, the width, color, and style can be simplified into one declaration. For example, consider the following CSS:

border-width: 1px;
border-style: solid;
border-color: #000;

It can be simplified as:

Shorthand versions of margin and padding values work similarly; the margin property allows for shorthand values to be specified using one, two, three, or four values. Consider the following CSS declarations:

margin-top: 10px;
margin-right: 5px;
margin-bottom: 10px;
margin-left: 5px;

They are the same as the following declaration using the four value shorthand. Note that the values are in clockwise order, beginning at the top: top, right, bottom, then left (TRBL, the consonants in "trouble").

margin: 10px 5px 10px 5px;

Margin shorthand rules for one, two, three and four value declarations are:

• 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 left and right, the third to the bottom.
• When four values are specified, the margins apply to the top, right, bottom, and left in that order (clockwise).

With position, the shorthand versions of top, right, bottom and left can be simplified into one declaration. For example, consider the following CSS:

top: 0;
right: 20px;
bottom: 0;
left: 20px;

It can be simplified as:

Just like margins and paddings, the inset values are ordered clockwise - top, right, bottom, then left (TRBL).

CSS provides a universal shorthand property, all, which applies its value to every property in the document. Its purpose is to change the properties' inheritance model.

See Handling conflicts or Introducing the CSS Cascade for more information about how inheritance works in CSS.

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