background-image

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句法
可访问性关注
形式定义
形式句法
范例
规范
浏览器兼容性
另请参阅
相关话题

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

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

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.

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 值。

注意： 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.

句法

Each background image is specified either as the keyword none or as an <image> 值。

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('https://mdn.mozillademos.org/files/7693/catfront.png');

值

none
<image>: 是 <image> denoting the image to display. There can be several of them, separated by commas, as multiple backgrounds are supported.

可访问性关注

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.

形式定义

初始值	`none`
适用于	所有元素。它还适用于 `::first-letter` and `::first-line` .
继承	no
计算值	as specified, but with `<url>` values made absolute
动画类型	discrete

形式句法

<bg-image>#where 
<bg-image> = none | <image>
where 
<image> = <url> | <image()> | <image-set()> | <element()> | <paint()> | <cross-fade()> | <gradient>
where 
<image()> = image( <image-tags>? [ <image-src>? , <color>? ]! )
<image-set()> = image-set( <image-set-option># )
<element()> = element( <id-selector> )
<paint()> = paint( <ident>, <declaration-value>? )
<cross-fade()> = cross-fade( <cf-mixing-image> , <cf-final-image>? )
<gradient> = <linear-gradient()> | <repeating-linear-gradient()> | <radial-gradient()> | <repeating-radial-gradient()> | <conic-gradient()>
where 
<image-tags> = ltr | rtl
<image-src> = <url> | <string>
<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>
<image-set-option> = [ <image> | <string> ] <resolution>
<id-selector> = <hash-token>
<cf-mixing-image> = <percentage>? && <image>
<cf-final-image> = <image> | <color>
<linear-gradient()> = linear-gradient( [ <angle> | to <side-or-corner> ]? , <color-stop-list> )
<repeating-linear-gradient()> = repeating-linear-gradient( [ <angle> | to <side-or-corner> ]? , <color-stop-list> )
<radial-gradient()> = radial-gradient( [ <ending-shape> || <size> ]? [ at <position> ]? , <color-stop-list> )
<repeating-radial-gradient()> = repeating-radial-gradient( [ <ending-shape> || <size> ]? [ at <position> ]? , <color-stop-list> )
<conic-gradient()> = conic-gradient( [ from <angle> ]? [ at <position> ]?, <angular-color-stop-list> )
where 
<rgb()> = rgb( <percentage>{3} [ / <alpha-value> ]? ) | rgb( <number>{3} [ / <alpha-value> ]? ) | rgb( <percentage>#{3} , <alpha-value>? ) | rgb( <number>#{3} , <alpha-value>? )
<rgba()> = rgba( <percentage>{3} [ / <alpha-value> ]? ) | rgba( <number>{3} [ / <alpha-value> ]? ) | rgba( <percentage>#{3} , <alpha-value>? ) | rgba( <number>#{3} , <alpha-value>? )
<hsl()> = hsl( <hue> <percentage> <percentage> [ / <alpha-value> ]? ) | hsl( <hue>, <percentage>, <percentage>, <alpha-value>? )
<hsla()> = hsla( <hue> <percentage> <percentage> [ / <alpha-value> ]? ) | hsla( <hue>, <percentage>, <percentage>, <alpha-value>? )
<side-or-corner> = [ left | right ] || [ top | bottom ]
<color-stop-list> = [ <linear-color-stop> [, <linear-color-hint>]? ]# , <linear-color-stop>
<ending-shape> = circle | ellipse
<size> = closest-side | farthest-side | closest-corner | farthest-corner | <length> | <length-percentage>{2}
<position> = [ [ left | center | right ] || [ top | center | bottom ] | [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ]? | [ [ left | right ] <length-percentage> ] && [ [ top | bottom ] <length-percentage> ] ]
<angular-color-stop-list> = [ <angular-color-stop> [, <angular-color-hint>]? ]# , <angular-color-stop>
where 
<alpha-value> = <number> | <percentage>
<hue> = <number> | <angle>
<linear-color-stop> = <color> <color-stop-length>?
<linear-color-hint> = <length-percentage>
<length-percentage> = <length> | <percentage>
<angular-color-stop> = <color> && <color-stop-angle>?
<angular-color-hint> = <angle-percentage>
where 
<color-stop-length> = <length-percentage>{1,2}
<color-stop-angle> = <angle-percentage>{1,2}
<angle-percentage> = <angle> | <percentage>

范例

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 cats<br />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("https://mdn.mozillademos.org/files/6457/mdn_logo_only_color.png");
}
.catsandstars {
  background-image:
      url("https://mdn.mozillademos.org/files/11991/startransparent.gif"),
      url("https://mdn.mozillademos.org/files/7693/catfront.png");
  background-color: transparent;
}

结果

规范

规范	状态	注释
CSS Backgrounds and Borders Module Level 3 The definition of 'background-image' in that specification.	候选推荐	From CSS2 Revision 1, the property has been extended to support multiple backgrounds and any `<image>` CSS data type.
CSS Level 2 (Revision 1) The definition of 'background-image' in that specification.	推荐	From CSS1, the way images with and without intrinsic dimensions are handled is now described.
CSS Level 1 The definition of 'background-image' in that specification.	推荐	初始定义。

浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`background-image`	Chrome 完整支持 1	Edge 完整支持 12	Firefox 完整支持 1 注意事项完整支持 1 注意事项注意事项若 `browser.display.use_document_colors` user preference in `about:config` is set to `false` , background images will not be displayed.	IE 完整支持 4	Opera 完整支持 3.5	Safari 完整支持 1	WebView Android 完整支持 ≤37	Chrome Android 完整支持 18	Firefox Android 完整支持 4 注意事项完整支持 4 注意事项注意事项若 `browser.display.use_document_colors` user preference in `about:config` is set to `false` , background images will not be displayed.	Opera Android 完整支持 14	Safari iOS 完整支持 1	Samsung Internet Android 完整支持 1.0
`element()`	Chrome 不支持 No	Edge 不支持 No	Firefox 完整支持 4 Prefixed 完整支持 4 Prefixed Prefixed Implemented with the vendor prefix: -moz-	IE 不支持 No	Opera 不支持 No	Safari 不支持 No	WebView Android 不支持 No	Chrome Android 不支持 No	Firefox Android 完整支持 4 Prefixed 完整支持 4 Prefixed Prefixed Implemented with the vendor prefix: -moz-	Opera Android 不支持 No	Safari iOS 不支持 No	Samsung Internet Android 不支持 No
Gradients	Chrome 完整支持 1 注意事项完整支持 1 注意事项注意事项 Some versions support only experimental gradients prefixed with `-webkit` .	Edge 完整支持 12	Firefox 完整支持 3.6 注意事项完整支持 3.6 注意事项注意事项 Some versions support only experimental gradients prefixed with `-moz` .	IE 完整支持 10	Opera 完整支持 11 注意事项完整支持 11 注意事项注意事项 Some versions support only experimental gradients prefixed with `-o` .	Safari 完整支持 4 注意事项完整支持 4 注意事项注意事项 Some versions support only experimental gradients prefixed with `-webkit` .	WebView Android 完整支持 ≤37 注意事项完整支持 ≤37 注意事项注意事项 Some versions support only experimental gradients prefixed with `-webkit` .	Chrome Android 完整支持 18 注意事项完整支持 18 注意事项注意事项 Some versions support only experimental gradients prefixed with `-webkit` .	Firefox Android 完整支持 4 注意事项完整支持 4 注意事项注意事项 Some versions support only experimental gradients prefixed with `-moz` .	Opera Android 完整支持 14 注意事项完整支持 14 注意事项注意事项 Some versions support only experimental gradients prefixed with `-webkit` .	Safari iOS 完整支持 3.2 注意事项完整支持 3.2 注意事项注意事项 Some versions support only experimental gradients prefixed with `-webkit` .	Samsung Internet Android 完整支持 1.0 注意事项完整支持 1.0 注意事项注意事项 Some versions support only experimental gradients prefixed with `-webkit` .
`image-rect()`	Chrome 不支持 No	Edge 不支持 No	Firefox 完整支持 4 Prefixed 完整支持 4 Prefixed Prefixed Implemented with the vendor prefix: -moz-	IE 不支持 No	Opera 不支持 No	Safari 不支持 No	WebView Android 不支持 No	Chrome Android 不支持 No	Firefox Android 完整支持 4 Prefixed 完整支持 4 Prefixed Prefixed Implemented with the vendor prefix: -moz-	Opera Android 不支持 No	Safari iOS 不支持 No	Samsung Internet Android 不支持 No
`image-set()`	Chrome 完整支持 21 Prefixed 完整支持 Prefixed Prefixed Implemented with the vendor prefix: -webkit-	Edge 完整支持 79 Prefixed 完整支持 Prefixed Prefixed Implemented with the vendor prefix: -webkit-	Firefox 不支持 No 注意事项不支持 No 注意事项注意事项见 bug 1107646 .	IE 不支持 No	Opera 完整支持 15 Prefixed 完整支持 Prefixed Prefixed Implemented with the vendor prefix: -webkit-	Safari 部分支持 6 Prefixed 注意事项部分支持 6 Prefixed 注意事项 Prefixed Implemented with the vendor prefix: -webkit- 注意事项支持 `url` images only and `x` is the only supported resolution unit. See bug 160934 .	WebView Android 完整支持 4.4 Prefixed 完整支持 Prefixed Prefixed Implemented with the vendor prefix: -webkit-	Chrome Android 完整支持 25 Prefixed 完整支持 Prefixed Prefixed Implemented with the vendor prefix: -webkit-	Firefox Android 不支持 No 注意事项不支持 No 注意事项注意事项见 bug 1107646 .	Opera Android 完整支持 14 Prefixed 完整支持 Prefixed Prefixed Implemented with the vendor prefix: -webkit-	Safari iOS 部分支持 6 Prefixed 注意事项部分支持 6 Prefixed 注意事项 Prefixed Implemented with the vendor prefix: -webkit- 注意事项支持 `url` images only and `x` is the only supported resolution unit. See bug 160934 .	Samsung Internet Android 完整支持 1.5 Prefixed 完整支持 Prefixed Prefixed Implemented with the vendor prefix: -webkit-
Multiple backgrounds	Chrome 完整支持 1	Edge 完整支持 12	Firefox 完整支持 3.6	IE 完整支持 9	Opera 完整支持 10.5	Safari 完整支持 1.3	WebView Android 完整支持 ≤37	Chrome Android 完整支持 18	Firefox Android 完整支持 4	Opera Android 完整支持 14	Safari iOS 完整支持 1	Samsung Internet Android 完整支持 1.0
SVG images	Chrome 完整支持 8	Edge 完整支持 12	Firefox 完整支持 4	IE 完整支持 9	Opera 完整支持 9.5	Safari 完整支持 5 注意事项完整支持 5 注意事项注意事项 Support of SVG in CSS background is incomplete.	WebView Android 完整支持 ≤37	Chrome Android 完整支持 18	Firefox Android 完整支持 4	Opera Android 完整支持 14	Safari iOS 完整支持 5 注意事项完整支持 5 注意事项注意事项 Support of SVG in CSS background is incomplete.	Samsung Internet Android 完整支持 1.0

图例

完整支持
部分支持
不支持
见实现注意事项。
要求使用供应商前缀或不同名称。

另请参阅

Implementing image sprites in CSS
<img>
Image-related data types: <image> , <gradient>
Image-related functions:

元数据

最后修改： Oct 31, 2020

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句法

值