边框样式属性 | border-top-style
border-top-style CSS属性设置元素的顶部的线条样式border。
/* Keyword values */
border-top-style: none;
border-top-style: hidden;
border-top-style: dotted;
border-top-style: dashed;
border-top-style: solid;
border-top-style: double;
border-top-style: groove;
border-top-style: ridge;
border-top-style: inset;
border-top-style: outset;
/* Global values */
border-top-style: inherit;
border-top-style: initial;
border-top-style: unset;注意：规范没有定义不同风格的边界如何连接角落。
返回值 | none |
|---|---|
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 | as specified |
Animation type | discrete |
正规顺序 | the unique non-ambiguous order defined by the formal grammar |
语法
该border-top-style属性被指定为从border-style属性中选择的单个关键字。
正式语法
<br-style>where
<br-style> = none | hidden | dotted | dashed | solid | double | groove | ridge | inset | outset示例
HTML
<table>
? <tr>
??? <td class="b1">none</td>
??? <td class="b2">hidden</td>
??? <td class="b3">dotted</td>
??? <td class="b4">dashed</td>
? </tr>
? <tr>
??? <td class="b5">solid</td>
??? <td class="b6">double</td>
??? <td class="b7">groove</td>
??? <td class="b8">ridge</td>
? </tr>
? <tr>
??? <td class="b9">inset</td>
??? <td class="b10">outset</td>
? </tr>
</table>CSS
/* Define look of the table */
table {
? border-width: 2px;
? background-color: #52E385;
}
tr, td {
? padding: 3px;
}
/* border-top-style example classes */
.b1 {border-top-style: none;}
.b2 {border-top-style: hidden;}
.b3 {border-top-style: dotted;}
.b4 {border-top-style: dashed;}
.b5 {border-top-style: solid;}
.b6 {border-top-style: double;}
.b7 {border-top-style: groove;}
.b8 {border-top-style: ridge;}
.b9 {border-top-style: inset;}
.b10 {border-top-style: outset;}结果
规范
Specification | Status | Comment |
|---|---|---|
CSS Backgrounds and Borders Module Level 3The definition of 'border-top-style' in that specification. | Candidate Recommendation | No significant change. |
CSS Level 2 (Revision 1)The definition of 'border-top-style' in that specification. | Recommendation | Initial definition. |
浏览器兼容性
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
Basic Support | 1 | (Yes) | 11 | 5.5 | 9.2 | 1 |
Feature | Android | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
|---|---|---|---|---|---|---|---|
Basic Support | ? | ? | (Yes) | (Yes)1 | ? | ? | ? |
在Firefox 50之前，圆角（带border-radius）的边框样式总是呈现为好像border-top-style被设定成solid一样。这已在Firefox 50中修复。
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