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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: alignment-baseline
+slug: Web/SVG/Attribute/alignment-baseline
+tags:
+ - SVG
+ - SVG属性
+ - 需要兼容性表
+translation_of: Web/SVG/Attribute/alignment-baseline
+---
+<p>« <a href="/en/SVG/Attribute" title="en/SVG/Attribute">SVG属性参考主页</a></p>
+
+<p><code>alignment-baseline</code>属性指定了一个对象如何相对于它的父元素对齐。这个属性指定了该元素的基线对齐到相应的父元素的基线。举个例子,允许罗马文字中的字母表基线在字体大小发生变化时保持一致。它的默认值是baseline,与该<code>alignment-baseline</code>属性的计算值同名。</p>
+
+<p>作为一个外观属性,它还可以直接作为CSS样式表内部的属性使用。请阅读{{ cssxref("alignment-baseline","CSS alignment-baseline") }}以了解更多信息。</p>
+
+<h2 id="用法">用法</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="row">类别</th>
+ <td>外观属性</td>
+ </tr>
+ <tr>
+ <th scope="row">值</th>
+ <td><strong>auto</strong> | baseline | before-edge | text-before-edge | middle | central | after-edge | text-after-edge | ideographic | alphabetic | hanging | mathematical | inherit</td>
+ </tr>
+ <tr>
+ <th scope="row">可变性</th>
+ <td>Yes</td>
+ </tr>
+ <tr>
+ <th scope="row">规范文档</th>
+ <td><a class="external" href="http://www.w3.org/TR/SVG11/text.html#AlignmentBaselineProperty" title="http://www.w3.org/TR/SVG11/text.html#AlignmentBaselineProperty">SVG 1.1 (2nd Edition)</a></td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="示例">示例</h2>
+
+<pre><code>&lt;?xml version="1.0"?&gt;
+&lt;svg width="300" height="120" viewBox="0 0 300 120"
+ xmlns="http://www.w3.org/2000/svg" version="1.1"&gt;
+
+ &lt;!-- Materialisation of anchors --&gt;
+ &lt;path d="M60,10 L60,110
+ M30,10 L300,10
+ M30,65 L300,65
+ M30,110 L300,110
+ " stroke="grey" /&gt;
+
+ &lt;!-- Anchors in action --&gt;
+ &lt;text alignment-baseline="hanging"
+ x="60" y="10"&gt;A hanging&lt;/text&gt;
+
+ &lt;text alignment-baseline="middle"
+ x="60" y="65"&gt;A middle&lt;/text&gt;
+
+ &lt;text alignment-baseline="baseline"
+ x="60" y="110"&gt;A baseline&lt;/text&gt;
+
+ &lt;!-- Materialisation of anchors --&gt;
+ &lt;circle cx="60" cy="10" r="3" fill="red" /&gt;
+ &lt;circle cx="60" cy="65" r="3" fill="red" /&gt;
+ &lt;circle cx="60" cy="110" r="3" fill="red" /&gt;
+
+&lt;style&gt;&lt;![CDATA[
+text{
+ font: bold 36px Verdana, Helvetica, Arial, sans-serif;
+}
+]]&gt;&lt;/style&gt;
+&lt;/svg&gt;</code>
+</pre>
+
+<h2 id="元素">元素</h2>
+
+<p>下列元素使用<code>alignment-baseline属性:</code></p>
+
+<ul>
+ <li>{{ SVGElement("tspan") }}</li>
+ <li>{{ SVGElement("tref") }}</li>
+ <li>{{ SVGElement("altGlyph") }}</li>
+ <li>{{ SVGElement("textPath") }}</li>
+</ul>
+
+<p>如果对象要在别的元素中对齐(比如在{{ SVGElement("text") }}元素中),请阅读{{ SVGAttr("dominant-baseline") }}。</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{ cssxref("alignment-baseline","CSS alignment-baseline") }}</li>
+</ul>