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+---
+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>
+
+<pre class="syntaxbox notranslate">{{csssyntax}}</pre>
+
+<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>