底部边框颜色 | border-bottom-color

border-bottom-color

border-bottom-color 属性设置一个元素底部边框的颜色。应当指出，在多数情况下，CSS 简写属性 border-color或border-bottom更方便实用。

/* <color> values */
border-bottom-color: red;
border-bottom-color: #ffbb00;
border-bottom-color: rgb(255, 0, 0
border-bottom-color: hsla(100%, 50%, 25%, 0.75
border-bottom-color: currentColor;
border-bottom-color: transparent;

/* Global values */
border-bottom-color: inherit;
border-bottom-color: initial;
border-bottom-color: unset;

初始值	currentcolor
适用元素	all elements. It also applies to ::first-letter.
是否是继承属性	no
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

border-bottom-color属性被指定为单个值。

值

<color>一个描绘底边的颜色的 CSS<color>值。

正式语法

<color>where 
<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>
where 
<rgb()> = rgb( [ [ <percentage>{3} | <number>{3} ] [ / <alpha-value> ]? ] | [ [ <percentage>#{3} | <number>#{3} ] , <alpha-value>? ] )
<rgba()> = rgba( [ [ <percentage>{3} | <number>{3} ] [ / <alpha-value> ]? ] | [ [ <percentage>#{3} | <number>#{3} ] , <alpha-value>? ] )
<hsl()> = hsl( [ <hue> <percentage> <percentage> [ / <alpha-value> ]? ] | [ <hue>, <percentage>, <percentage>, <alpha-value>? ] )
<hsla()> = hsla( [ <hue> <percentage> <percentage> [ / <alpha-value> ]? ] | [ <hue>, <percentage>, <percentage>, <alpha-value>? ] )
where 
<alpha-value> = <number> | <percentage>
<hue> = <number> | <angle>

示例

一个带有边框的简单 div

HTML

<div class="mybox">
  <p>This is a box with a border around it.
     Note which side of the box is
     <span class="redtext">red</span>.</p>
</div>

CSS

.mybox {
  border: solid 0.3em gold;
  border-bottom-color: red;
  width: auto;
}

.redtext {
  color: red;
}

结果

规范

Specification	Status	Comment
CSS Backgrounds and Borders Module Level 3The definition of 'border-bottom-color' in that specification.	Candidate Recommendation	No significant changes, though the transparent keyword, now included in <color> which has been extended, has been formally removed.
CSS Level 2 (Revision 1)The definition of 'border-bottom-color' in that specification.	Recommendation	Initial definition

浏览器兼容性

Feature	Chrome	Edge	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	1.0	(Yes)	1.0 (1.7 or earlier)1	4	3.5	1.0 (85)

Feature	Android	Edge	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	1.0	(Yes)	1.0 (1.0)1	6.5	11	1.0

1 Firefox等基于Gecko的浏览器也支持将底部边框设置为多种颜色的非标准CSS属性-moz-border-bottom-colors。

另见

边界相关的简写属性：border，border-bottom，和border-color。

对于其他边框颜色相关CSS属性：border-right-color，border-top-color，和border-left-color。

应用于相同的边框的其他边框相关的CSS属性：border-bottom-style和border-bottom-width。