background-color

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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-color CSS property sets the background color of 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.

句法

/* Keyword values */
background-color: red;
background-color: indigo;
/* Hexadecimal value */
background-color: #bbff00;    /* Fully opaque */
background-color: #bf0;       /* Fully opaque shorthand */
background-color: #11ffee00;  /* Fully transparent */
background-color: #1fe0;      /* Fully transparent shorthand  */
background-color: #11ffeeff;  /* Fully opaque */
background-color: #1fef;      /* Fully opaque shorthand  */
/* RGB value */
background-color: rgb(255, 255, 128);        /* Fully opaque */
background-color: rgba(117, 190, 218, 0.5);  /* 50% transparent */
/* HSL value */
background-color: hsl(50, 33%, 25%);         /* Fully opaque */
background-color: hsla(50, 33%, 25%, 0.75);  /* 75% transparent */
/* Special keyword values */
background-color: currentcolor;
background-color: transparent;
/* Global values */
background-color: currentcolor;
background-color: transparent;
background-color: transparent;

background-color property is specified as a single <color> 值。

值

<color>: The uniform color of the background. It is rendered behind any background-image that is specified, although the color will still be visible through any transparency in the image.

可访问性关注

It is important to ensure that the contrast ratio between the background color and the color of the text placed over it is high enough that people experiencing low vision conditions will be able to read the content of the page.

Color contrast ratio is determined by comparing the luminance of the text and background color values. In order to meet current Web Content Accessibility Guidelines (WCAG) , a ratio of 4.5:1 is required for text content and 3:1 for larger text such as headings. Large text is defined as 18.66px and bold or larger, or 24px or larger.

形式定义

初始值	`transparent`
适用于	所有元素。它还适用于 `::first-letter` and `::first-line` .
继承	no
计算值	computed color
动画类型	a color

形式句法

<color>where 
<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>
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>? )
where 
<alpha-value> = <number> | <percentage>
<hue> = <number> | <angle>

范例

HTML

<div class="exampleone">
  Lorem ipsum dolor sit amet, consectetuer
</div>
<div class="exampletwo">
  Lorem ipsum dolor sit amet, consectetuer
</div>
<div class="examplethree">
  Lorem ipsum dolor sit amet, consectetuer
</div>

CSS

.exampleone { background-color: transparent; }
.exampletwo {
  background-color: rgb(153,102,153);
  color: rgb(255,255,204);
}
.examplethree {
  background-color: #777799;
  color: #FFFFFF;
}

结果

规范

规范	注释	Feedback
CSS Backgrounds and Borders Module Level 3 The definition of 'background-color' in that specification.	Though technically removing the `transparent` keyword, this doesn't change anything as it has been incorporated as a true `<color>`	Backgrounds Level 3 GitHub issues
CSS Level 2 (Revision 1) The definition of 'background-color' in that specification.
CSS Level 1 The definition of 'background-color' in that specification.	初始定义

浏览器兼容性

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-color`	Chrome 完整支持 1	Edge 完整支持 12	Firefox 完整支持 1	IE 完整支持 4 注意事项完整支持 4 注意事项注意事项 In Internet Explorer 8 and 9, there is a bug where a computed `background-color` of `transparent` causes `click` events to not get fired on overlaid elements.	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	Opera Android 完整支持 14	Safari iOS 完整支持 1	Samsung Internet Android 完整支持 1.0

图例

完整支持
见实现注意事项。

另请参阅

Multiple backgrounds
<color> data type
Other color-related properties: color , border-color , outline-color , text-decoration-color , text-emphasis-color , text-shadow , caret-color ，和 column-rule-color
Applying color to HTML elements using CSS

元数据

最后修改： Oct 6, 2020

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句法

值