background
The background shorthand CSS property sets all background style properties at once, such as color, image, origin and size, or repeat method. Component properties not set in the background shorthand property value declaration are set to their default values.
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Constituent properties
This property is a shorthand for the following CSS properties:
Syntax
/* Using a */ background: green; /* Using a and */ background: url("test.jpg") repeat-y; /* Using a and */ background: border-box red; /* A single image, centered and scaled */ background: no-repeat center/80% url("../img/image.png"); /* Global values */ background: inherit; background: initial; background: revert; background: revert-layer; background: unset;
The background property is specified as one or more background layers, separated by commas.
The syntax of each layer is as follows:
- Each layer may include zero or one occurrences of any of the following values:
- The value may only be included immediately after , separated with the ‘/’ character, like this: » center/80% «.
- The value may be included zero, one, or two times. If included once, it sets both background-origin and background-clip . If it is included twice, the first occurrence sets background-origin , and the second sets background-clip .
- The value may only be included in the last layer specified.
Values
See background-clip and background-origin . Default: border-box and padding-box respectively.
See background-color . Default: transparent .
The following three lines of CSS are equivalent:
background: none; background: transparent; background: repeat scroll 0% 0% / auto padding-box border-box none transparent;
Accessibility concerns
Browsers do not provide any special information on background images to assistive technology. This is important primarily for screen readers, as a screen reader will not announce its presence and therefore convey nothing to its users. If the image contains information critical to understanding the page’s overall purpose, it is better to describe it semantically in the document.
Formal definition
- background-image : none
- background-position : 0% 0%
- background-size : auto auto
- background-repeat : repeat
- background-origin : padding-box
- background-clip : border-box
- background-attachment : scroll
- background-color : transparent
- background-position : refer to the size of the background positioning area minus size of background image; size refers to the width for horizontal offsets and to the height for vertical offsets
- background-size : relative to the background positioning area
- background-image : as specified, but with url() values made absolute
- background-position : as each of the properties of the shorthand:
- background-position-x : A list, each item consisting of: an offset given as a combination of an absolute length and a percentage, plus an origin keyword
- background-position-y : A list, each item consisting of: an offset given as a combination of an absolute length and a percentage, plus an origin keyword
- background-color : a color
- background-image : discrete
- background-clip : a repeatable list of
- background-position : a repeatable list of
- background-size : a repeatable list of
- background-repeat : discrete
- background-attachment : discrete
Formal syntax
background =
[ # , ]?=
||
[ / ]? ||
||
||
||
=
||
||
[ / ]? ||
||
||
||
=
|
none=
[ left | center | right | top | bottom | ] |
[ left | center | right | ] [ top | center | bottom | ] |
[ center | [ left | right ] ? ] && [ center | [ top | bottom ] ? ]=
[ | auto ] |
cover |
contain=
repeat-x |
repeat-y |
[ repeat | space | round | no-repeat ]=
scroll |
fixed |
local=
border-box |
padding-box |
content-box=
|=
|=
url( * ) |
src( * )Examples
Setting backgrounds with color keywords and images
HTML
p class="topbanner"> Starry skybr /> Twinkle twinklebr /> Starry sky p> p class="warning">Here is a paragraphp> p>p>
CSS
.warning background: pink; > .topbanner background: url("starsolid.gif") #99f repeat-y fixed; >Result
Specifications
Browser compatibility
BCD tables only load in the browser
See also
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This page was last modified on Jul 18, 2023 by MDN contributors.
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