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+---
+title: <msub>
+slug: Web/MathML/Element/msub
+translation_of: Web/MathML/Element/msub
+---
+<p>{{MathMLRef()}}</p>
+
+<p>MathML の <code>&lt;msub&gt;</code> 要素は式に下付きを付けるために用います。<br>
+ 構文は <code>&lt;msub&gt; <em>base subscript</em> &lt;/msub&gt;</code> となります。</p>
+
+<h2 id="属性">属性</h2>
+
+<dl>
+ <dt id="attr-class-id-style">class, id, style</dt>
+ <dd>Provided for use with <a href="/en-US/docs/CSS">stylesheets</a>.</dd>
+ <dt id="attr-href">href</dt>
+ <dd>Used to set a hyperlink to a specified URI.</dd>
+ <dt id="attr-mathbackground">mathbackground</dt>
+ <dd>The background color. You can use <code>#rgb</code>, <code>#rrggbb</code> and <a href="/en-US/docs/CSS/color_value#Color_Keywords">HTML color names</a>.</dd>
+ <dt id="attr-mathcolor">mathcolor</dt>
+ <dd>The text color. You can use <code>#rgb</code>, <code>#rrggbb</code> and <a href="/en-US/docs/CSS/color_value#Color_Keywords">HTML color names</a>.</dd>
+ <dt id="attr-subscriptshift">subscriptshift</dt>
+ <dd>下付き部分を本体のベースラインから下げる最小量を <a href="/en-US/docs/MathML/Attributes/Values#Lengths">length value</a> として指定します。</dd>
+</dl>
+
+<h2 id="例">例</h2>
+
+<p>Sample rendering: <img alt="x1" src="/files/3202/msub.png" style="margin-left: 10px; vertical-align: middle;"></p>
+
+<p>Rendering in your browser: <math> <msub> <mi>X</mi> <mn>1</mn> </msub> </math></p>
+
+<pre class="brush: html">&lt;math&gt;
+
+  &lt;msub&gt;
+    &lt;mi&gt;X&lt;/mi&gt;
+    &lt;mn&gt;1&lt;/mn&gt;
+  &lt;/msub&gt;
+
+&lt;/math&gt;
+</pre>
+
+<h2 id="ブラウザ毎の互換性">ブラウザ毎の互換性</h2>
+
+
+
+<p>{{Compat("mathml.elements.msub")}}</p>
+
+<h3 id="Specifications" name="Specifications">Gecko-specific notes</h3>
+
+<ul>
+ <li>Starting with Gecko 26.0 {{geckoRelease("26")}} it is no longer possible to use <code>&lt;none /&gt;</code> as a child element. The rendering has been made more consistent with equivalent configurations of {{MathMLElement("msup")}} and {{MathMLElement("mmultiscripts")}} and a bug with an incorrect application <code>of the </code><code>superscriptshift</code> attribute has been fixed (see {{bug("827713")}} for details).</li>
+</ul>
+
+<h2 id="Specifications" name="Specifications">仕様</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('MathML3', 'chapter3.html#presm.msub', 'msub') }}</td>
+   <td>{{ Spec2('MathML3') }}</td>
+   <td>Current specification</td>
+  </tr>
+  <tr>
+   <td>{{ SpecName('MathML2', 'chapter3.html#presm.msub', 'msub') }}</td>
+   <td>{{ Spec2('MathML2') }}</td>
+   <td>Initial specification</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{ MathMLElement("msup") }} (Superscript)</li>
+ <li>{{ MathMLElement("msubsup") }} (Subscript-superscript pair)</li>
+ <li>{{ MathMLElement("mmultiscripts") }} (Prescripts and tensor indices)</li>
+</ul>