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border-top-style CSS 设置元素上边框的 {{cssxref("border")}}.

{{InteractiveExample("CSS Demo: border-top-style")}}

```css interactive-example-choice border-top-style: none;

```css interactive-example-choice
border-top-style: dotted;

```css interactive-example-choice border-top-style: dashed;

```css interactive-example-choice
border-top-style: solid;

```css interactive-example-choice border-top-style: groove;

```css interactive-example-choice
border-top-style: inset;

```html interactive-example

This is a box with a border around it.

```css interactive-example
#example-element {
  background-color: #eee;
  color: #000;
  border: 0.75em solid;
  padding: 0.75em;
  width: 80%;
  height: 100px;
}

body {
  background-color: #fff;
}

[!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 {{cssxref("border-style")}} 的 border-top-style 属性的值。

形式语法

{{csssyntax}}

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

{{ EmbedLiveSample('示例', 300, 200) }}