边框属性颜色 | border-top-color (Backgrounds & Borders) - CSS 中文开发手册
border-top-colorCSS属性设置元素的顶部的颜色border。请注意，在许多情况下，简化的CSS属性border-color或border-top更方便，更可取。
/* <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;
| 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
该border-top-color属性被指定为单个值。
值
<color>顶部边框的颜色。
正式语法
<color>where
<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>
where
<rgb()> = rgb( [ [ <percentage>{3} | <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
带有边界的简单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-top-color: red;
auto;
}
.redtext {
color: red;
} 结果
规范
| Specification | Status | Comment |
|---|---|---|
| CSS Backgrounds and Borders Module Level 3The definition of 'border-top-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-top-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 | 4.0 | 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 |
Firefox等基于壁虎的浏览器也支持-moz-border-top-colors将顶部边框设置为多种颜色的非标准CSS属性。
另见
边界相关的简写属性：border，border-top，和border-color。对于其他边框颜色相关CSS属性：border-right-color，border-bottom-color，和border-left-color。应用于同一边框的其他与边界相关的CSS属性：border-top-style和border-top-width。
CSS 中文开发手册