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+---
+title: Valores
+slug: Web/MathML/Attribute/Values
+tags:
+  - Guía
+  - MathML
+  - Referência de MathML
+translation_of: Web/MathML/Attribute/Values
+original_slug: Web/MathML/Attribute/Valores
+---
+<div>{{MathMLRef}}</div>
+
+<h2 id="Comprimentos">Comprimentos</h2>
+
+<p>Vários elementos de apresentação MathML têm atributos que aceitam valores de comprimento usados para dimensões ou espaçamento. MathML aceita diferentes unidades e constantes para indicar comprimentos.</p>
+
+<h3 id="Unidades">Unidades</h3>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th>Unidade</th>
+   <th>Descrição</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td><code>em</code></td>
+   <td>Unidade {{ Cssxref("font-size", "relativa à fonte") }}</td>
+  </tr>
+  <tr>
+   <td><code>ex</code></td>
+   <td>Unidade {{ Cssxref("font-size", "relativa à fonte") }}. (A altura "x" do elemento, <code>1ex ≈ 0.5em</code> em muitas fontes)</td>
+  </tr>
+  <tr>
+   <td><code>px</code></td>
+   <td>Pixeis</td>
+  </tr>
+  <tr>
+   <td><code>in</code></td>
+   <td>Polegadas (1 polegada = 2,54 centímetros)</td>
+  </tr>
+  <tr>
+   <td><code>cm</code></td>
+   <td>Centímetros</td>
+  </tr>
+  <tr>
+   <td><code>mm</code></td>
+   <td>Milímetros</td>
+  </tr>
+  <tr>
+   <td><code>pt</code></td>
+   <td>Pontos (1 ponto = 1/72 polegada)</td>
+  </tr>
+  <tr>
+   <td><code>pc</code></td>
+   <td>Picas (1 pica = 12 pontos)</td>
+  </tr>
+  <tr>
+   <td><code>%</code></td>
+   <td>Percentagem do valor padrão.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h3 id="Constantes">Constantes</h3>
+
+<p>{{deprecated_header}}</p>
+
+<p>Um substituto para as constantes depreciadas abaixo é:</p>
+
+<pre class="notranslate"><code>veryverythinmathspace  =&gt; 0.05555555555555555em
+verythinmathspace      =&gt; 0.1111111111111111em
+thinmathspace          =&gt; 0.16666666666666666em
+mediummathspace        =&gt; 0.2222222222222222em
+thickmathspace         =&gt; 0.2777777777777778em
+verythickmathspace     =&gt; 0.3333333333333333em
+veryverythickmathspace =&gt; 0.3888888888888889em</code></pre>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th>Constante</th>
+   <th>Valor</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td><code>veryverythinmathspace</code></td>
+   <td>1/18<code>em</code></td>
+  </tr>
+  <tr>
+   <td><code>verythinmathspace</code></td>
+   <td>2/18<code>em</code></td>
+  </tr>
+  <tr>
+   <td><code>thinmathspace</code></td>
+   <td>3/18<code>em</code></td>
+  </tr>
+  <tr>
+   <td><code>mediummathspace</code></td>
+   <td>4/18<code>em</code></td>
+  </tr>
+  <tr>
+   <td><code>thickmathspace</code></td>
+   <td>5/18<code>em</code></td>
+  </tr>
+  <tr>
+   <td><code>verythickmathspace</code></td>
+   <td>6/18<code>em</code></td>
+  </tr>
+  <tr>
+   <td><code>veryverythickmathspace</code></td>
+   <td>7/18<code>em</code></td>
+  </tr>
+ </tbody>
+ <thead>
+  <tr>
+   <th colspan="2"><em>Constantes</em> negativas são introduzidas em Gecko 7.0 {{ geckoRelease("7.0") }} ({{ bug(650530) }})</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td><code>negativeveryverythinmathspace</code></td>
+   <td>-1/18<code>em</code></td>
+  </tr>
+  <tr>
+   <td><code>negativeverythinmathspace</code></td>
+   <td>-2/18<code>em</code></td>
+  </tr>
+  <tr>
+   <td><code>negativethinmathspace</code></td>
+   <td>-3/18<code>em</code></td>
+  </tr>
+  <tr>
+   <td><code>negativemediummathspace</code></td>
+   <td>-4/18<code>em</code></td>
+  </tr>
+  <tr>
+   <td><code>negativethickmathspace</code></td>
+   <td>-5/18<code>em</code></td>
+  </tr>
+  <tr>
+   <td><code>negativeverythickmathspace</code></td>
+   <td>-6/18<code>em</code></td>
+  </tr>
+  <tr>
+   <td><code>negativeveryverythickmathspace</code></td>
+   <td>-7/18<code>em</code></td>
+  </tr>
+ </tbody>
+</table>
+
+<p>Nota: <a class="external" href="http://www.w3.org/TR/MathML3/chapter3.html#id.3.3.4.2.1" rel="external" title="http://www.w3.org/TR/MathML3/chapter3.html#id.3.3.4.2.1">Associação através de <em>namespace</em> está depreciado</a> em MathML3 e foi removido em Gecko 15.0 {{ geckoRelease("15.0") }} (<a class="external" href="https://bugzilla.mozilla.org/show_bug.cgi?id=673759" rel="external">bug 673759</a>).</p>