---
title: border-top-style
slug: Web/CSS/border-top-style
tags:
  - CSS
  - CSS 属性
  - CSS 边框
translation_of: Web/CSS/border-top-style
---
<div>{{ CSSRef}}</div>

<p><strong><code>border-top-style</code></strong> <a href="/en/CSS">CSS</a> 设置元素上边框的 {{cssxref("border")}}.</p>

<div>{{EmbedInteractiveExample("pages/css/border-top-style.html")}}</div>



<div class="note"><strong>Note:</strong> 此规范并未定义不同样式的边框边角处如何连接。</div>

<h2 id="Syntax" name="Syntax">语法</h2>

<pre class="brush:css no-line-numbers notranslate">/* 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;
</pre>

<p>选取以上可用关键字之一作为 {{cssxref("border-style")}} 的 <strong>border-top-style</strong> 属性的值.</p>

<h3 id="形式化语法">形式化语法</h3>

{{csssyntax}}

<h2 id="Examples" name="Examples">示例</h2>

<h4 id="HTML">HTML</h4>

<pre class="brush: html notranslate">&lt;table&gt;
  &lt;tr&gt;
    &lt;td class="b1"&gt;none&lt;/td&gt;
    &lt;td class="b2"&gt;hidden&lt;/td&gt;
    &lt;td class="b3"&gt;dotted&lt;/td&gt;
    &lt;td class="b4"&gt;dashed&lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
    &lt;td class="b5"&gt;solid&lt;/td&gt;
    &lt;td class="b6"&gt;double&lt;/td&gt;
    &lt;td class="b7"&gt;groove&lt;/td&gt;
    &lt;td class="b8"&gt;ridge&lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
    &lt;td class="b9"&gt;inset&lt;/td&gt;
    &lt;td class="b10"&gt;outset&lt;/td&gt;
  &lt;/tr&gt;
&lt;/table&gt;</pre>

<h4 id="CSS">CSS</h4>

<pre class="brush: css notranslate">/* 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;}</pre>

<h4 id="输出结果">输出结果</h4>

<p>{{ EmbedLiveSample('Examples', 300, 200) }}</p>

<h2 id="Specifications" name="Specifications">规则</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">规则</th>
   <th scope="col">状态</th>
   <th scope="col">备注</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{ SpecName('CSS3 Backgrounds', '#the-border-style', 'border-top-style') }}</td>
   <td>{{ Spec2('CSS3 Backgrounds') }}</td>
   <td>No significant change.</td>
  </tr>
  <tr>
   <td>{{ SpecName('CSS2.1', 'box.html#border-style-properties', 'border-top-style') }}</td>
   <td>{{ Spec2('CSS2.1') }}</td>
   <td>Initial definition.</td>
  </tr>
 </tbody>
</table>

<p>{{cssinfo}}</p>

<h2 id="Browser_Compatibility" name="Browser_Compatibility">浏览器兼容性</h2>



<p>{{Compat("css.properties.border-top-style")}}</p>

<h2 id="See_Also" name="See_Also">相关词条</h2>

<ul>
 <li>The other style-related border properties: {{ Cssxref("border-left-style") }}, {{ Cssxref("border-right-style") }}, {{ Cssxref("border-bottom-style") }}, and {{ Cssxref("border-style") }}.</li>
 <li>The other top-border-related properties: {{ Cssxref("border-top") }}, {{ Cssxref("border-top-color") }}, and {{ Cssxref("border-top-width") }}.</li>
</ul>