background-color - CSS（层叠样式表） 编辑

概览

CSS属性中的 background-color 会设置元素的背景色, 属性的值为颜色值或关键字"transparent"二者选其一.

初始值	transparent
适用元素	all elements. It also applies to ::first-letter and ::first-line.
是否是继承属性	否
适用媒体	visual
计算值	computed color
Animation type	a color
正规顺序	the unique non-ambiguous order defined by the formal grammar

语法

/* Keyword values */
background-color: red;

/* Hexadecimal value */
background-color: #bbff00;

/* RGB value */
background-color: rgb(255, 255, 128);

/* HSLA value */
background-color: hsla(50, 33%, 25%, 0.75);

/* Special keyword values */
background-color: currentColor;
background-color: transparent;

/* Global values */
background-color: inherit;
background-color: initial;
background-color: unset;

background-color 属性只能使用 <color> 值。

取值

<color>

一个描述背景统一颜色的 CSS <color> 值。即使一个或几个的 background-image 被定义，如果图像是不透明的，通过透明度该颜色也能影响到渲染。在 CSS 中，transparent 是一种颜色。

正式语法

<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>

示例

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: teal;
  color: white;
}

.exampletwo {
  background-color: rgb(153,102,153);
  color: rgb(255,255,204);
}

.examplethree {
  background-color: #777799;
  color: #FFFFFF;
}

Result

规范

规范	状态	注释
CSS Backgrounds and Borders Module Level 3 background-color	Candidate Recommendation	Though technically removing thetransparentkeyword, this doesn't change anything as it has been incorporated as a true <color>
CSS Level 2 (Revision 1) background-color	Recommendation	没有变化
CSS Level 1 background-color	Recommendation	初始定义

浏览器兼容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

• Desktop
• Mobile

特性	Firefox (Gecko)	Chrome	Internet Explorer	Opera	Safari (WebKit)
基础支持	1.0 (1.7 or earlier)	1.0	4.0 [1]	3.5	1.0 (85)

特性	Firefox Mobile (Gecko)	Android	IE Phone	Opera Mobile	Safari Mobile
基础支持	1.0 (1.9.2)	(Yes)	(Yes)	(Yes)	(Yes)

[1]: In IE8-9, there is a bug where a computed background-color of transparent causes click events to not get fired on overlaid elements. See the click event documentation for details.

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• Multiple backgrounds