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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: border-left-width
+slug: Web/CSS/border-left-width
+tags:
+ - CSS
+ - CSS属性
+ - CSS边框
+translation_of: Web/CSS/border-left-width
+---
+<div>{{CSSRef}}</div>
+
+<p><a href="/en-US/docs/CSS" title="CSS">CSS</a> 的 <strong><code>border-left-width</code></strong> 属性用来设置盒子的左边框的宽度。</p>
+
+<div>{{EmbedInteractiveExample("pages/css/border-left-width.html")}}</div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush:css no-line-numbers">/* 关键字数值 */
+border-left-width: thin;
+border-left-width: medium;
+border-left-width: thick;
+
+/* 长度数值 */
+border-left-width: 10em;
+border-left-width: 3vmax;
+border-left-width: 6px;
+
+/* 全局关键字 */
+border-left-width: inherit;
+border-left-width: initial;
+border-left-width: unset;</pre>
+
+<h3 id="数值">数值</h3>
+
+<dl>
+ <dt><code>&lt;br-width&gt;</code></dt>
+ <dd>定义边框的宽度,或者作为显性非负的长度值 {{cssxref("&lt;length&gt;")}} 或者是关键字. 如果他是一个关键字,它必须是下列值的一种:
+ <table>
+ <tbody>
+ <tr>
+ <td><code>thin</code></td>
+ <td>
+ <div style="margin: 0.5em; width: 3em; height: 3em; border-left-style: solid; border-left-width: thin; background-color: palegreen;"> </div>
+ </td>
+ <td>一个细边框</td>
+ </tr>
+ <tr>
+ <td><code>medium</code></td>
+ <td>
+ <div style="margin: 0.5em; width: 3em; height: 3em; border-left-style: solid; border-left-width: medium; background-color: palegreen;"> </div>
+ </td>
+ <td>一个中等边框</td>
+ </tr>
+ <tr>
+ <td><code>thick</code></td>
+ <td>
+ <div style="margin: 0.5em; width: 3em; height: 3em; border-left-style: solid; border-left-width: thick; background-color: palegreen;"> </div>
+ </td>
+ <td>一个粗边框</td>
+ </tr>
+ </tbody>
+ </table>
+
+ <div class="note">
+ <p><strong>笔记:</strong> 因为规范没有定义每个关键字表示的确切厚度,当使用其中之一的关键字时,需要具体实施才知道确切结果。不过,它们通常遵循下面的模式 <code>thin ≤ medium ≤ thick</code>, 在单独文档中这些值内部是恒定不变的。</p>
+ </div>
+ </dd>
+</dl>
+
+<h3 id="形式语法">形式语法</h3>
+
+<pre class="syntaxbox">{{csssyntax}}</pre>
+
+<h2 id="例子">例子</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-left-width: thick;
+}
+div:nth-child(2) {
+ border-left-width: 2em;
+}</pre>
+
+<h3 id="结果">结果</h3>
+
+<p>{{EmbedLiveSample('Example', '100%')}}</p>
+
+<h2 id="规格">规格</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-left-width')}}</td>
+ <td>{{Spec2('CSS3 Backgrounds')}}</td>
+ <td>没有规格变化.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('CSS2.1', 'box.html#border-width-properties', 'border-left-width')}}</td>
+ <td>{{Spec2('CSS2.1')}}</td>
+ <td>没有规格变化</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('CSS1', '#border-left-width', 'border-left-width')}}</td>
+ <td>{{Spec2('CSS1')}}</td>
+ <td>最初的定义</td>
+ </tr>
+ </tbody>
+</table>
+
+<p>{{cssinfo}}</p>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("css.properties.border-left-width")}}</p>
+
+<h2 id="其他">其他</h2>
+
+<ul>
+ <li>The other border-width-related CSS properties: {{Cssxref("border-bottom-width")}}, {{Cssxref("border-right-width")}}, {{Cssxref("border-top-width")}}, and {{Cssxref("border-width")}}.</li>
+ <li>The other border-left-related CSS properties: {{Cssxref("border")}}, {{Cssxref("border-left")}}, {{Cssxref("border-left-style")}}, and {{Cssxref("border-left-color")}}.</li>
+</ul>