The <position> CSS data type denotes a two-dimensional coordinate used to set a location relative to an element box. It is used in the background-position property.

Note: The final position described by the <position> value does not need to be inside the element's box.

Syntax

The <position> data type is specified with one or two keywords, with optional offsets.

The keyword values are center, top, right, bottom, and left. Each keyword represents either an edge of the element's box or the center line between two edges. Depending on the context, center represents either the center between the left and right edges, or the center between the top and bottom edges.

If specified, an offset can be either a relative <percentage> value or an absolute <length> value. Positive values are offset towards the right or the bottom, whichever is appropriate. Negative values are offset in the opposite directions.

If only a single offset value is specified, it defines the x-coordinate, with the value for the other axis defaulting to center.

/* 1-value syntax */
keyword                  /* Either the horizontal or vertical position; the other axis defaults to center */
value                    /* The position on the x-axis; the y-axis defaults to 50% */

/* 2-value syntax */
keyword keyword          /* A keyword for each direction (the order is irrelevant) */
keyword value            /* A keyword for horizontal position, value for vertical position */
value keyword            /* A value for horizontal position, keyword for vertical position */
value value              /* A value for each direction (horizontal then vertical) */

/* 4-value syntax */
keyword value keyword value /* Each value is an offset from the keyword that preceeds it */

Formal syntax

[
 [ left | center | right ] || [ top | center | bottom ]
|
 [ left | center | right | <length> | <percentage> ]
 [ top | center | bottom | <length> | <percentage> ]?
|
 [ [ left | right ] [ <length> | <percentage> ] ] &&
 [ [ top | bottom ] [ <length> | <percentage> ] ]
]

Interpolation

When animated, a point's abscissa and ordinate values are interpolated independently. However, because the speed of the interpolation is determined by a single timing function for both coordinates, the point will move in a straight line.

Examples

Valid positions

center
left
center top

right 8.5%
bottom 12vmin right -6px

10% 20%
8rem 14px

Invalid positions

left right
bottom top
10px 15px 20px 15px

Specifications

Specification Status Comment
CSS Values and Units Module Level 3
The definition of '<position>' in that specification.
Candidate Recommendation Relists links to both definitions: if CSS Backgrounds and Borders Module Level 3 is supported, its definition of <position> must also be used.
CSS Backgrounds and Borders Module Level 3
The definition of '<position>' in that specification.
Candidate Recommendation Defines <position> explicitly and extends it to support offsets from any edge.
CSS Level 2 (Revision 1)
The definition of '<position>' in that specification.
Recommendation Allows combination of a keyword with a <length> or <percentage> value.
CSS Level 1
The definition of '<position>' in that specification.
Recommendation Defines <position> anonymously as the value of background-position.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support112143.51
Syntax combining a keyword and <length> or <percentage>112143.51
Four-value syntax for offset from any edge251213910.57
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes4 Yes Yes Yes
Syntax combining a keyword and <length> or <percentage> Yes Yes Yes4 Yes Yes Yes
Four-value syntax for offset from any edge Yes Yes Yes14 Yes7.1 Yes

Document Tags and Contributors

 Last updated by: mfuji09,