Background padding box css

Содержание

background
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Constituent properties
Syntax
Values
Accessibility concerns
Formal definition
Formal syntax
Examples
Setting backgrounds with color keywords and images
HTML
CSS
Result
Specifications
Browser compatibility
See also
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CSS background-clip Property
Definition and Usage
Browser Support
CSS Syntax
Property Values
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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

=
[ | auto ] |
cover |
contain

=
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

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Support

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Developers

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Portions of this content are ©1998– 2023 by individual mozilla.org contributors. Content available under a Creative Commons license.

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CSS background-clip Property

Specify how far the background should extend within an element:

Definition and Usage

The background-clip property defines how far the background (color or image) should extend within an element.

Default value:	border-box
Inherited:	no
Animatable:	no. Read about animatable
Version:	CSS3
JavaScript syntax:	object.style.backgroundClip=»content-box» Try it

Browser Support

The numbers in the table specify the first browser version that fully supports the property.

CSS Syntax

Property Values

Value	Description	Demo
border-box	Default value. The background extends behind the border	Demo ❯
padding-box	The background extends to the inside edge of the border	Demo ❯
content-box	The background extends to the edge of the content box	Demo ❯
initial	Sets this property to its default value. Read about initial
inherit	Inherits this property from its parent element. Read about inherit

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