border-top-color
border-top-color
属性用以设置某元素顶部 border
的颜色。通常,用border-color
或 border-top
设置该颜色更为便捷可取。
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语法
/* <color> values */
border-top-color: red;
border-top-color: #ffbb00;
border-top-color: rgb(255, 0, 0);
border-top-color: hsla(100%, 50%, 25%, 0.75);
border-top-color: currentColor;
border-top-color: transparent;
/* Global values */
border-top-color: inherit;
border-top-color: initial;
border-top-color: unset;
border-top-color
属性的值为单值。
值
<color>
- 上边框的颜色。
规范语法
<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
一个简单的带边框容器
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-top-color: red;
width: auto;
}
.redtext {
color: red;
}
结果
Specifications
Specification | Status | Comment |
---|---|---|
CSS Backgrounds and Borders Module Level 3 border-top-color |
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) border-top-color |
Recommendation | Initial definition |
初始值 | currentcolor |
---|---|
适用元素 | all elements. It also applies to ::first-letter . |
是否是继承属性 | 否 |
计算值 | computed color |
Animation type | a color |
浏览器兼容性
BCD tables only load in the browser
See also
- The border-related CSS shorthand properties:
border
,border-top
, andborder-color
. - The color-related CSS properties for the other borders:
border-right-color
,border-bottom-color
, andborder-left-color
. - The other border-related CSS properties applying to the same border:
border-top-style
andborder-top-width
.