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+---
+title: margin-block-start
+slug: Web/CSS/margin-block-start
+translation_of: Web/CSS/margin-block-start
+---
+<p>{{CSSRef}}{{SeeCompatTable}}</p>
+
+<p><strong><code>margin-block-start</code></strong> <a href="/en-US/docs/Web/CSS" title="CSS">CSS</a> 属性定义了一个元素的逻辑块的开始边距, 是用来根据元素的书写模式，方向和文本方向进行实际边界的衡量。</p>
+
+<pre class="brush:css no-line-numbers">/* &lt;length&gt; values */
+margin-block-start: 10px;  /* 绝对长度 */
+margin-block-start: 1em;   /* 文本的相对大小 */
+margin-block-start: 5%;    /* 相对于最近块容器的大小 */
+
+/* 关键字值 */
+margin-block-start: auto;
+
+/* 全局值 */
+margin-block-start: inherit;
+margin-block-start: initial;
+margin-block-start: unset
+</pre>
+
+<p>{{cssxref("margin-top")}}, {{cssxref("margin-right")}}, {{cssxref("margin-bottom")}}, or {{cssxref("margin-left")}} 属性对应于 {{cssxref("writing-mode")}}, {{cssxref("direction")}}, 和{{cssxref("text-orientation")}}属性定义的值.</p>
+
+<p>它涉及到 {{cssxref("margin-block-end")}}, {{cssxref("margin-inline-start")}},和 {{cssxref("margin-inline-end")}}属性, 这些属性是用来定义其它元素的边界。</p>
+
+<p>{{cssinfo}}</p>
+
+<h2 id="Syntax">Syntax</h2>
+
+<h3 id="Values">Values</h3>
+
+<p><code>margin-block-start</code> 属性有着和 {{cssxref("margin-left")}} 属性一样的值.</p>
+
+<h3 id="Formal_syntax">Formal syntax</h3>
+
+<pre class="syntaxbox">{{csssyntax}}</pre>
+
+<h2 id="案例">案例</h2>
+
+<h3 id="HTML_Content">HTML Content</h3>
+
+<pre class="brush: html">&lt;div&gt;
+  &lt;p class="exampleText"&gt;Example text&lt;/p&gt;
+&lt;/div&gt;
+</pre>
+
+<h3 id="CSS_Content">CSS Content</h3>
+
+<pre class="brush: css">div {
+  background-color: yellow;
+  width: 120px;
+  height: 120px;
+}
+
+.exampleText {
+  writing-mode: vertical-lr;
+  margin-block-start: 20px;
+  background-color: #c8c800;
+}</pre>
+
+<p>{{EmbedLiveSample("Example", 140, 140)}}</p>
+
+<h2 id="Specification">Specification</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("CSS Logical Properties", "#propdef-margin-block-start", "margin-block-start")}}</td>
+   <td>{{Spec2("CSS Logical Properties")}}</td>
+   <td>初始定义</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+
+
+<p>{{Compat("css.properties.margin-block-start")}}</p>
+
+<h2 id="同样推荐">同样推荐</h2>
+
+<ul>
+ <li>标记的物理属性: {{cssxref("margin-top")}}, {{cssxref("margin-right")}}, {{cssxref("margin-bottom")}}, and {{cssxref("margin-left")}}</li>
+ <li>{{cssxref("writing-mode")}}, {{cssxref("direction")}}, {{cssxref("text-orientation")}}</li>
+</ul>