I volontari di MDN non hanno ancora tradotto questo articolo in Italiano. Unisciti a noi e traducilo tu stesso.
Puoi anche consultare l’articolo in English (US).

The background-position-y CSS property sets the initial vertical position for each background image. The position is relative to the position layer set by background-origin.

The value of this property is overridden by any declaration of the background or background-position shorthand properties applied to the element after it.

Syntax

/* Keyword values */
background-position-y: top;
background-position-y: center;
background-position-y: bottom;

/* <percentage> values */
background-position-y: 25%;

/* <length> values */
background-position-y: 0px;
background-position-y: 1cm;
background-position-y: 8em;

/* Side-relative values */
background-position-y: bottom 3px;
background-position-y: bottom 10%;

/* Multiple values */
background-position-y: 0px, center;

/* Global values */
background-position-y: inherit;
background-position-y: initial;
background-position-y: unset;

The background-position-y property is specified as one or more values, separated by commas.

Values

top
Aligns the top edge of the background image with the top edge of the background position layer.
center
Aligns the vertical center of the background image with the vertical center of the background position layer.
bottom
Aligns the bottom edge of the background image with the bottom edge of the background position layer.
<length>
The offset of the given background image's horizontal edge from the corresponding background position layer's top horizontal edge. (Some browsers allow assigning the bottom edge for offset).
<percentage>
The offset of the given background image's vertical position relative to the container. A value of 0% means that the top edge of the background image is aligned with the top edge of the container, and a value of 100% means that the bottom edge of the background image is aligned with the bottom edge of the container, thus a value of 50% vertically centers the background image.

Formal syntax

[ center | [ top | bottom | y-start | y-end ]? <length-percentage>? ]#

where
<length-percentage> = <length> | <percentage>

Specifications

Specification Status Comment
CSS Backgrounds and Borders Module Level 4
The definition of 'background-position-y' in that specification.
Editor's Draft Initial specification of longhand sub-properties of background-position to match longstanding implementations.
Initial valuetop
Applies toall elements
Inheritedno
Percentagesrefer to height of background positioning area minus height of background image
Mediavisual
Computed valueA list, each item consisting of: an offset given as a combination of an absolute length and a percentage, plus an origin keyword
Animation typediscrete
Canonical orderthe unique non-ambiguous order defined by the formal grammar

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
background-position-yChrome Full support 1Edge Full support 12Firefox Full support 49IE Full support 6Opera Full support 15Safari Full support 1WebView Android Full support ≤37Chrome Android Full support 18Firefox Android Full support 49Opera Android Full support 14Safari iOS Full support 1Samsung Internet Android Full support 1.0
Two-value syntax (support for offsets from any edge)Chrome No support NoEdge Full support 12Firefox Full support 49IE Full support 9Opera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoFirefox Android Full support 49Opera Android No support NoSafari iOS No support NoSamsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support

See also

Tag del documento e collaboratori

Hanno collaborato alla realizzazione di questa pagina: ddbeck, mdnwebdocs-bot, Myndex, wbamberg, mfluehr, fscholz, captainbarbosa, teoli, erikadoyle, Sebastianz, DBaron
Ultima modifica di: ddbeck,