<position>

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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 and offset-anchor properties.

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> ] ]
]

Note: The background-position property also accepts a three-value syntax. This is not allowed in other properties that use <position>.

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

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
<position>Chrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 4Opera Full support 3.5Safari Full support 1WebView Android Full support ≤37Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support YesSafari iOS Full support 1Samsung Internet Android Full support 1.0
Four-value syntax for offset from any edgeChrome Full support 25Edge Full support 12Firefox Full support 13IE Full support 9Opera Full support 10.5Safari Full support 7WebView Android Full support ≤37Chrome Android Full support 25Firefox Android Full support 14Opera Android Full support YesSafari iOS Full support 7Samsung Internet Android Full support 1.5
Syntax combining a keyword and <length> or <percentage>Chrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 4Opera Full support 3.5Safari Full support 1WebView Android Full support ≤37Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support YesSafari iOS Full support 1Samsung Internet Android Full support 1.0
Three-value syntax for properties other than background-position
Deprecated
Chrome No support 25 — 68Edge Full support 12Firefox No support 13 — 70IE Full support 9Opera No support 10.5 — 55Safari Full support 1WebView Android No support ≤37 — 68Chrome Android No support 25 — 68Firefox Android Full support 14Opera Android No support ? — 48Safari iOS Full support 1Samsung Internet Android No support 1.5 — 10.0

Legend

Full support  
Full support
No support  
No support
Deprecated. Not for use in new websites.
Deprecated. Not for use in new websites.

See Also