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index.md
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---
title: border-top-style
slug: Web/CSS/border-top-style
---
{{CSSRef}}
**`border-top-style`** [CSS](/zh-CN/CSS) 设置元素上边框的 {{cssxref("border")}}.
{{EmbedInteractiveExample("pages/css/border-top-style.html")}}
> **备注:** 此规范并未定义不同样式的边框边角处如何连接。
## 语法
```css
/* 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
```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
```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) }}
## 规范
{{Specifications}}
{{cssinfo}}
## 浏览器兼容性
{{Compat}}
## 参见
- The other style-related border properties: {{ Cssxref("border-left-style") }}, {{ Cssxref("border-right-style") }}, {{ Cssxref("border-bottom-style") }}, and {{ Cssxref("border-style") }}.
- The other top-border-related properties: {{ Cssxref("border-top") }}, {{ Cssxref("border-top-color") }}, and {{ Cssxref("border-top-width") }}.