Firefox background image css

background-image

The background-image CSS property sets one or more background images on an element.

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The background images are drawn on stacking context layers on top of each other. The first layer specified is drawn as if it is closest to the user.

The borders of the element are then drawn on top of them, and the background-color is drawn beneath them. How the images are drawn relative to the box and its borders is defined by the background-clip and background-origin CSS properties.

If a specified image cannot be drawn (for example, when the file denoted by the specified URI cannot be loaded), browsers handle it as they would a none value.

Note: Even if the images are opaque and the color won’t be displayed in normal circumstances, web developers should always specify a background-color . If the images cannot be loaded—for instance, when the network is down—the background color will be used as a fallback.

Syntax

Each background image is specified either as the keyword none or as an value.

To specify multiple background images, supply multiple values, separated by a comma:

background-image: linear-gradient(to bottom, rgba(255,255,0,0.5), rgba(0,0,255,0.5)), url('catfront.png'); /* Global values */ background-image: inherit; background-image: initial; background-image: revert; background-image: revert-layer; background-image: unset;

Values

Is a keyword denoting the absence of images.

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

Initial value	none
Applies to	all elements. It also applies to ::first-letter and ::first-line .
Inherited	no
Computed value	as specified, but with url() values made absolute
Animation type	discrete

Formal syntax

background-image = bg-image># bg-image> = image> | none image> = url> | gradient> 

Examples

Layering background images

Note that the star image is partially transparent and is layered over the cat image.

HTML

div> p class="catsandstars"> This paragraph is full of catsbr />and stars. p> p>This paragraph is not. p> p class="catsandstars"> Here are more cats for you.br />Look at them! p> p>And no more. p> div> 

CSS

p < font-size: 1.5em; color: #FE7F88; background-image: none; background-color: transparent; > div < background-image: url("mdn_logo_only_color.png"); > .catsandstars < background-image: url("startransparent.gif"), url("catfront.png"); background-color: transparent; >

Result

Specifications

Источник

background-image

The background-image CSS property sets one or more background images on an element.

Try it

The background images are drawn on stacking context layers on top of each other. The first layer specified is drawn as if it is closest to the user.

The borders of the element are then drawn on top of them, and the background-color is drawn beneath them. How the images are drawn relative to the box and its borders is defined by the background-clip and background-origin CSS properties.

If a specified image cannot be drawn (for example, when the file denoted by the specified URI cannot be loaded), browsers handle it as they would a none value.

Note: Even if the images are opaque and the color won’t be displayed in normal circumstances, web developers should always specify a background-color . If the images cannot be loaded—for instance, when the network is down—the background color will be used as a fallback.

Syntax

background-image: linear-gradient( to bottom, rgba(255, 255, 0, 0.5), rgba(0, 0, 255, 0.5) ), url("catfront.png"); /* Global values */ background-image: inherit; background-image: initial; background-image: revert; background-image: revert-layer; background-image: unset; 

Each background image is specified either as the keyword none or as an value.

To specify multiple background images, supply multiple values, separated by a comma.

Values

Is a keyword denoting the absence of images.

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

Initial value	none
Applies to	all elements. It also applies to ::first-letter and ::first-line .
Inherited	no
Computed value	as specified, but with url() values made absolute
Animation type	discrete

Formal syntax

Examples

Layering background images

Note that the star image is partially transparent and is layered over the cat image.

HTML

div> p class="catsandstars">This paragraph is full of catsbr />and stars.p> p>This paragraph is not.p> p class="catsandstars">Here are more cats for you.br />Look at them!p> p>And no more.p> div> 

CSS

p  font-size: 1.5em; color: #fe7f88; background-image: none; background-color: transparent; > div  background-image: url("mdn_logo_only_color.png"); > .catsandstars  background-image: url("startransparent.gif"), url("catfront.png"); background-color: transparent; > 

Result

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• Implementing image sprites in CSS
• Image-related data types: ,
• Image-related functions:
  • cross-fade()
  • element()
  • image()
  • image-set()
  • linear-gradient()
  • radial-gradient()
  • conic-gradient()
  • repeating-linear-gradient()
  • repeating-radial-gradient()
  • repeating-conic-gradient()
  • paint()
  • url()

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  This page was last modified on Jul 20, 2023 by MDN contributors.

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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.

  Try it

  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

      Found a content problem with this page?

      This page was last modified on Jul 18, 2023 by MDN contributors.

      Your blueprint for a better internet.

      MDN

      Support

      Our communities

      Developers

      Visit Mozilla Corporation’s not-for-profit parent, the Mozilla Foundation.
      Portions of this content are ©1998– 2023 by individual mozilla.org contributors. Content available under a Creative Commons license.

      Источник