From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: border-top-width
+slug: Web/CSS/border-top-width
+translation_of: Web/CSS/border-top-width
+---
+<div>{{CSSRef}}</div>
+
+<p>css属性 <strong><code>border-top-width</code></strong> 是用于设置盒模型的上边框的宽度</p>
+
+<div>{{EmbedInteractiveExample("pages/css/border-top-width.html")}}</div>
+
+
+
+<h2 id="Syntax" name="Syntax">Syntax</h2>
+
+<pre class="brush:css no-line-numbers">/* Keyword values */
+border-top-width: thin;
+border-top-width: medium;
+border-top-width: thick;
+
+/* &lt;length&gt; values */
+border-top-width: 10em;
+border-top-width: 3vmax;
+border-top-width: 6px;
+
+/* Global keywords */
+border-top-width: inherit;
+border-top-width: initial;
+border-top-width: unset;
+</pre>
+
+<h3 id="Values">Values</h3>
+
+<dl>
+ <dt><code>&lt;br-width&gt;</code></dt>
+ <dd>上边框的宽度属性的有效值要么是一个具体的非负数，要么是一个关键字。如果是关键字，必须是一下几种：
+ <table class="standard-table">
+  <tbody>
+   <tr>
+    <td style="vertical-align: middle;"><code>thin</code></td>
+    <td style="vertical-align: middle;">
+     <div style="margin: 0.5em; width: 3em; height: 3em; border-top-style: solid; border-top-width: thin; background-color: palegreen;"> </div>
+    </td>
+    <td style="vertical-align: middle;">A thin border</td>
+   </tr>
+   <tr>
+    <td style="vertical-align: middle;"><code>medium</code></td>
+    <td style="vertical-align: middle;">
+     <div style="margin: 0.5em; width: 3em; height: 3em; border-top-style: solid; border-top-width: medium; background-color: palegreen;"> </div>
+    </td>
+    <td style="vertical-align: middle;">A medium border</td>
+   </tr>
+   <tr>
+    <td style="vertical-align: middle;"><code>thick</code></td>
+    <td style="vertical-align: middle;">
+     <div style="margin: 0.5em; width: 3em; height: 3em; border-top-style: solid; border-top-width: thick; background-color: palegreen;"> </div>
+    </td>
+    <td style="vertical-align: middle;">A thick border</td>
+   </tr>
+  </tbody>
+ </table>
+
+ <div class="note">
+ <p><strong>Note:</strong> Because the specification doesn't define the exact thickness denoted by each keyword, the precise result when using one of them is implementation-specific. Nevertheless, they always follow the pattern <code>thin ≤ medium ≤ thick</code>, and the values are constant within a single document.</p>
+ </div>
+ </dd>
+</dl>
+
+<h3 id="Formal_syntax">Formal syntax</h3>
+
+<pre class="syntaxbox">{{csssyntax}}</pre>
+
+<h2 id="Example">Example</h2>
+
+<h3 id="HTML">HTML</h3>
+
+<pre class="brush: html">&lt;div&gt;Element 1&lt;/div&gt;
+&lt;div&gt;Element 2&lt;/div&gt;</pre>
+
+<h3 id="CSS">CSS</h3>
+
+<pre class="brush: css">div {
+  border: 1px solid red;
+  margin: 1em 0;
+}
+
+div:nth-child(1) {
+  border-top-width: thick;
+}
+div:nth-child(2) {
+  border-top-width: 2em;
+}</pre>
+
+<h3 id="Result">Result</h3>
+
+<p>{{EmbedLiveSample('Example', '100%')}}</p>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('CSS3 Backgrounds', '#the-border-width', 'border-top-width')}}</td>
+   <td>{{Spec2('CSS3 Backgrounds')}}</td>
+   <td>No significant change.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('CSS2.1', 'box.html#border-width-properties', 'border-top-width')}}</td>
+   <td>{{Spec2('CSS2.1')}}</td>
+   <td>No significant change.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('CSS1', '#border-left-width', 'border-top-width')}}</td>
+   <td>{{Spec2('CSS1')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<p>{{cssinfo}}</p>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">Browser compatibility</h2>
+
+
+
+<p>{{Compat("css.properties.border-top-width")}}</p>
+
+<h2 id="See_also" name="See_also">See also</h2>
+
+<ul>
+ <li>The other border-width-related CSS properties: {{Cssxref("border-left-width")}}, {{Cssxref("border-right-width")}}, {{Cssxref("border-bottom-width")}}, and {{Cssxref("border-width")}}.</li>
+ <li>The other border-top-related CSS properties: {{Cssxref("border")}}, {{Cssxref("border-top")}}, {{Cssxref("border-top-style")}}, and {{Cssxref("border-top-color")}}.</li>
+</ul>
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