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color - CSS（层叠样式表）编辑

colorCSS属性设置颜色值的前景色以及文本装饰，并设置currentcolor值。currentcolor可以对其他颜色属性用作不直接的值，比如border-color。对于在HTML中使用颜色的概述，参考使用CSS对HTML元素实现颜色。

语法

/* 关键词 */
color: currentcolor;

/* <named-color>值 */
color: red;
color: orange;
color: tan;
color: rebeccapurple;

/* <hex-color>值 */
color: #090;
color: #009900;
color: #090a;
color: #009900aa;

/* <rgb()>值 */
color: rgb(34, 12, 64, 0.6);
color: rgba(34, 12, 64, 0.6);
color: rgb(34 12 64 / 0.6);
color: rgba(34 12 64 / 0.3);
color: rgb(34.0 12 64 / 60%);
color: rgba(34.6 12 64 / 30%);

/* <hsl()>值 */
color: hsl(30, 100%, 50%, 0.6);
color: hsla(30, 100%, 50%, 0.6);
color: hsl(30 100% 50% / 0.6);
color: hsla(30 100% 50% / 0.6);
color: hsl(30.0 100% 50% / 60%);
color: hsla(30.2 100% 50% / 60%);

/* 全局值 */
color: inherit;
color: initial;
color: unset;

color 属性被指定为一个单个的 <color>值。

注意值必须是规则的 color。它不可以是<gradient>（实际上为<image>的一部分）。

It is important to ensure that the contrast ratio between the color of the text and the background the text is placed over 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 luminosity 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.

正规定义

初始值	Varies from one browser to another
适用元素	all elements. It also applies to `::first-letter` and `::first-line`.
是否是继承属性	yes
计算值	If the value is translucent, the computed value will be the `rgba()` corresponding one. If it isn't, it will be the `rgb()` corresponding one. The `transparent` keyword maps to `rgba(0,0,0,0)`.
Animation type	a color

正规语法

<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

使文本为红色

以下方式可以使得文本显示为红色：

p { color: red; }
p { color: #f00; }
p { color: #ff0000; }
p { color: rgb(255,0,0); }
p { color: rgb(100%, 0%, 0%); }
p { color: hsl(0, 100%, 50%); }

/* 50%透明 */
p { color: #ff000080; }
p { color: rgba(255, 0, 0, 0.5); }
p { color: hsla(0, 100%, 50%, 0.5); }

指定

Specification	Status	Comment
CSS Color Module Level 4 color	Working Draft	Adds commaless syntaxes for the `rgb()`, `rgba()`, `hsl()`, and `hsla()` functions. Allows alpha values in `rgb()` and `hsl()`, turning `rgba()` and `hsla()` into (deprecated) aliases for them. Adds color keyword `rebeccapurple`. Adds 4- and 8-digit hex color values, where the last digit(s) represents the alpha value. Adds `hwb()`, `device-cmyk()`, and `color()` functions.
CSS Color Module Level 3 color	Recommendation	Deprecates system-colors. Adds SVG colors. Adds the `rgba()`, `hsl()`, and `hsla()` functions.
CSS Level 2 (Revision 1) color	Recommendation	Adds the `orange` color and the system colors.
CSS Level 1 color	Recommendation	Initial definition.