border-top-style

border-top-style CSS 设置元素上边框的 border.

Note: 此规范并未定义不同样式的边框边角处如何连接。

语法

/* 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;

选取以上可用关键字之一作为 border-style 的 border-top-style 属性的值.

形式化语法

<line-style>
where 
<line-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;}

输出结果

规则

规则 状态 备注
CSS Backgrounds and Borders Module Level 3
border-top-style		 Candidate Recommendation No significant change.
CSS Level 2 (Revision 1)
border-top-style		 Recommendation Initial definition.

初始值none
适用元素all elements. It also applies to ::first-letter.
是否是继承属性否
计算值as specified
Animation typediscrete

浏览器兼容性

BCD tables only load in the browser

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