<mo>

  • Revision slug: Web/MathML/Element/mo
  • Revision title: mo
  • Revision id: 384717
  • Created:
  • Creator: Sheppy
  • Is current revision? No
  • Comment Chrome removed supportMoved From MathML/Element/mo to Web/MathML/Element/mo

Revision Content

The MathML <mo> element represents an operator in a broad sense. Besides operators in strict mathematical meaning, this element also includes "operators" like parentheses, separators like comma and semicolon, or "absolute value" bars.

Attributes

accent
If the operator is used as an under- or overscript this attribute specifies whether the operator should be treated as an accent.
Allowed values are true or false.
class, id, style
Provided for use with stylesheets.
dir
The text direction. Possible values are either ltr (left to right) or rtl (right to left).
fence
There is no visual effect for this attribute, but it specifies whether the operator is a fence (such as parentheses).
Allowed values are true or false.
form
Specifies the role of the operator in an enclosed expression, which affects spacing and other default properties. For ordinary operators (+, -, etc. ) you usually do not need to specify this attribute explicitly.
Possible values are:
  • prefix, for opening fences. (It is the default value if the operator is the first argument in a {{ MathMLElement("mrow") }} element with more than one argument.)
  • infix, for separators. (It is the default value if the operator is not included in a {{ MathMLElement("mrow") }} element.)
  • postfix, closing fences. (It is the default value if the operator is the last argument in a {{ MathMLElement("mrow") }} element with more than one argument.)
href
Used to set a hyperlink to a specified URI.
largeop
Specifies whether the operator should be drawn larger than normal when displaystyle="true" is set. Allowed values are either true or false.
lspace
The amount of space before the operator (see length for values and units). The constant thickmathspace (5/18em) is the default value.
mathbackground
The background color. You can use #rgb, #rrggbb and HTML color names.
mathcolor
The text color. You can use #rgb, #rrggbb and HTML color names.
mathsize
The size of the content. Possible values are:
  • small: Font is rendered smaller than the current font size.
  • normal: Equivalent to 100% or 1em.
  • big: Font is rendered larger than the current font size.
  • a custom length.
  • or a unitless value which multiplies the default.
mathvariant (partially implemented, see {{ bug("114365") }} & {{ bug("162405") }})
This attribute specifies the logical class of the operator which varies in typography. That is, although the names suggest the typographic style for the class, semantically, items with the same class are treated "the same" within an expression, which might or might not involve displaying them with the named typography. The following values are allowed:
  • normal (default value)
  • bold
  • italic (default value)
  • bold-italic
  • double-struck {{ unimplemented_inline() }}
  • bold-fraktur {{ unimplemented_inline() }} (bold works)
  • script {{ unimplemented_inline() }}
  • bold-script {{ unimplemented_inline() }} (bold works)
  • fraktur {{ unimplemented_inline() }}
  • sans-serif
  • bold-sans-serif
  • sans-serif-italic
  • sans-serif-bold-italic
  • monospace
  • initial {{ unimplemented_inline() }}
  • tailed {{ unimplemented_inline() }}
  • looped {{ unimplemented_inline() }}
  • stretched {{ unimplemented_inline() }}
maxsize
If stretchy is true, this attribute specifies the maximum size of the operator. Allowed values are:
  • infinity
  • an arbitrary length
minsize
If stretchy is true, this attribute specifies the minimum size of the operator. Allowed values are:
  • infinity
  • an arbitrary length
movablelimits
Specifies whether attached under- and overscripts move to sub- and superscript positions when displaystyle is false.
Allowed values are either true or false.
rspace
The amount of space after the operator (see length for values and units). The constant thickmathspace (5/18em) is the default value.
separator
There is no visual effect for this attribute, but it specifies whether the operator is a separator (such as commas).
Allowed values are true or false.
stretchy
Specifies whether the operator stretches to the size of the adjacent element.
Allowed values are true or false.
symmetric
If stretchy is true, this attribute specifies whether the operator should be vertically symmetric around the imaginary math axis (centered fraction line).
The default value is true if stretchy is set to true and otherwise false. Allowed values are true or false.

Examples

<math>

<mrow>
  <mn>5</mn>
  <mo>+</mo>
  <mn>5</mn>
</mrow> 

<mrow>
  <mo> [ </mo> <!-- default form value: prefix --> 
  <mrow>
    <mn> 0 </mn>
    <mo> ; </mo> <!-- default form value: infix --> 
    <mn> 1 </mn>
  </mrow>
  <mo> ) </mo> <!-- default form value: postfix -->
</mrow>

</math>

Browser compatibility

{{ CompatibilityTable() }}

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support {{ CompatNo() }} (24 only) {{ CompatGeckoDesktop("1.0") }} {{ CompatNo() }} 9.5 5.1
accent {{ CompatNo() }} {{ CompatGeckoDesktop("1.0") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
dir {{ CompatNo() }} {{ CompatGeckoDesktop("12.0") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
form {{ CompatNo() }} {{ CompatNo() }} {{ bug("562460") }} {{ CompatNo() }} 9.5 {{ CompatNo() }}
href {{ CompatNo() }} {{webkitbug(85733)}} {{ CompatGeckoDesktop("7.0") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }} {{webkitbug(85733)}}
largeop {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }} 9.5 {{ CompatNo() }}
lspace, rspace {{ CompatNo() }} {{ CompatGeckoDesktop("1.0") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
mathsize {{ CompatNo() }} (24 only) {{ CompatGeckoDesktop("1.0") }} {{ CompatNo() }} {{ CompatNo() }} 5.1
mathvariant {{ CompatNo() }} (24 only) partially supported (see above) {{ CompatNo() }} partially supported (see above) partially supported (see above)
maxsize, minsize {{ CompatNo() }} {{ CompatGeckoDesktop("1.0") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
movablelimits {{ CompatNo() }} {{ CompatGeckoDesktop("1.0") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
stretchy {{ CompatNo() }} (24 only) {{ CompatGeckoDesktop("1.0") }} {{ CompatNo() }} {{ CompatNo() }} 5.1
symmetric {{ CompatNo() }} {{ CompatGeckoDesktop("1.0") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support {{ CompatNo() }} {{ CompatNo() }} {{ CompatGeckoMobile("1.9.2") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
accent {{ CompatNo() }} {{ CompatNo() }} {{ CompatGeckoMobile("1.9.2") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
dir {{ CompatNo() }} {{ CompatNo() }} {{ CompatGeckoMobile("12.0") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
form {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }} {{ bug("562460") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
href {{ CompatNo() }} {{ CompatNo() }} {{ CompatGeckoMobile("7.0") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
largeop {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
lspace, rspace {{ CompatNo() }} {{ CompatNo() }} {{ CompatGeckoMobile("1.9.2") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
mathsize {{ CompatNo() }} {{ CompatNo() }} {{ CompatGeckoMobile("1.9.2") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
mathvariant {{ CompatNo() }} {{ CompatNo() }} partially supported (see above) {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
maxsize, minsize {{ CompatNo() }} {{ CompatNo() }} {{ CompatGeckoMobile("1.9.2") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
movablelimits {{ CompatNo() }} {{ CompatNo() }} {{ CompatGeckoMobile("1.9.2") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
stretchy {{ CompatNo() }} {{ CompatNo() }} {{ CompatGeckoMobile("1.9.2") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
symmetric {{ CompatNo() }} {{ CompatNo() }} {{ CompatGeckoMobile("1.9.2") }} {{ CompatNo() }} {{ CompatNo() }} {{ CompatNo() }}
Note: Any linebreaking or indentation attributes are not implemented yet. For Gecko see {{ bug("534962") }}.

Gecko-specific notes

  • Starting with Gecko 16.0 {{ geckoRelease("16.0") }} the default values for lspace and rspace have been corrected to match the MathML3 specification. They now default to the constant thickmathspace (5/18em).
  • Starting with Gecko 20.0 {{geckoRelease("20.0")}} a unitless value for mathsize is allowed.

Specifications

Specification Status Comment
{{ SpecName('MathML3', 'chapter3.html#presm.mo', 'mo') }} {{ Spec2('MathML3') }} Current specification
{{ SpecName('MathML2', 'chapter3.html#presm.mo', 'mo') }} {{ Spec2('MathML2') }} Initial specification

 

Revision Source

<p>The MathML <code>&lt;mo&gt;</code> element represents an operator in a broad sense. Besides operators in strict mathematical meaning, this element also includes "operators" like parentheses, separators like comma and semicolon, or "absolute value" bars.</p>
<h2 id="Attributes">Attributes</h2>
<dl>
  <dt id="attr-accent">
    accent</dt>
  <dd>
    If the operator is used as an <a href="/en-US/docs/MathML/Element/munder">under</a>- or <a href="/en-US/docs/MathML/Element/mover">overscript</a> this attribute specifies whether the operator should be treated as an accent.<br />
    Allowed values are <code>true</code> or <code>false</code>.</dd>
  <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-dir">
    dir</dt>
  <dd>
    The text direction. Possible values are either <code>ltr</code> (left to right) or <code>rtl</code> (right to left).</dd>
  <dt id="attr-fence">
    fence</dt>
  <dd>
    There is no visual effect for this attribute, but it specifies whether the operator is a fence (such as parentheses).<br />
    Allowed values are <code>true</code> or <code>false</code>.</dd>
  <dt id="attr-form">
    form</dt>
  <dd>
    Specifies the role of the operator in an enclosed expression, which affects spacing and other default properties. For ordinary operators (+, -, etc. ) you usually do not need to specify this attribute explicitly.<br />
    Possible values are:
    <ul>
      <li><code>prefix</code>, for opening fences. (It is the default value if the operator is the first argument in a {{ MathMLElement("mrow") }} element with more than one argument.)</li>
      <li><code>infix</code>, for separators. (It is the default value if the operator is not included in a {{ MathMLElement("mrow") }} element.)</li>
      <li><code>postfix</code>, closing fences. (It is the default value if the operator is the last argument in a {{ MathMLElement("mrow") }} element with more than one argument.)</li>
    </ul>
  </dd>
  <dt id="attr-href">
    href</dt>
  <dd>
    Used to set a hyperlink to a specified URI.</dd>
  <dt id="attr-largeop">
    largeop</dt>
  <dd>
    Specifies whether the operator should be drawn larger than normal when <code>displaystyle="true"</code> is set. Allowed values are either <code>true</code> or <code>false</code>.</dd>
  <dt id="attr-lspace">
    lspace</dt>
  <dd>
    The amount of space before the operator (see <a href="/en-US/docs/MathML/Attributes/Values#Lengths">length</a> for values and units). The constant <code>thickmathspace</code> (5/18em) is the default value.</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-mathsize">
    mathsize</dt>
  <dd>
    The size of the content. Possible values are:
    <ul>
      <li><code>small:</code> Font is rendered smaller than the current font size.</li>
      <li><code>normal:</code> Equivalent to 100% or 1em.</li>
      <li><code>big:</code> Font is rendered larger than the current font size.</li>
      <li>a custom <a href="/en-US/docs/MathML/Attributes/Values#Lengths">length</a>.</li>
      <li>or a unitless value which multiplies the default.</li>
    </ul>
  </dd>
  <dt id="attr-mathvariant">
    mathvariant (partially implemented, see {{ bug("114365") }} &amp; {{ bug("162405") }})</dt>
  <dd>
    This attribute specifies the logical class of the operator which varies in typography. That is, although the names suggest the typographic style for the class, semantically, items with the same class are treated "the same" within an expression, which might or might not involve displaying them with the named typography. The following values are allowed:
    <ul>
      <li><code>normal</code> (default value)</li>
      <li><code>bold</code></li>
      <li><code>italic</code> (default value)</li>
      <li><code>bold-italic</code></li>
    </ul>
    <ul>
      <li><code>double-struck</code> {{ unimplemented_inline() }}</li>
      <li><code>bold-fraktur</code> {{ unimplemented_inline() }} (bold works)</li>
      <li><code>script</code> {{ unimplemented_inline() }}</li>
      <li><code>bold-script</code> {{ unimplemented_inline() }} (bold works)</li>
      <li><code>fraktur</code> {{ unimplemented_inline() }}</li>
    </ul>
    <ul>
      <li><code>sans-serif</code></li>
      <li><code>bold-sans-serif</code></li>
      <li><code>sans-serif-italic</code></li>
      <li><code>sans-serif-bold-italic</code></li>
      <li><code>monospace</code></li>
    </ul>
    <ul>
      <li><code>initial</code> {{ unimplemented_inline() }}</li>
      <li><code>tailed</code> {{ unimplemented_inline() }}</li>
      <li><code>looped</code> {{ unimplemented_inline() }}</li>
      <li><code>stretched</code> {{ unimplemented_inline() }}</li>
    </ul>
  </dd>
  <dt id="attr-maxsize">
    maxsize</dt>
  <dd>
    If <strong>stretchy</strong> is <code>true</code>, this attribute specifies the maximum size of the operator. Allowed values are:
    <ul>
      <li><code>infinity</code></li>
      <li>an arbitrary <a href="/en-US/docs/MathML/Attributes/Values#Lengths">length</a></li>
    </ul>
  </dd>
  <dt id="attr-minsize">
    minsize</dt>
  <dd>
    If <strong>stretchy</strong> is <code>true</code>, this attribute specifies the minimum size of the operator. Allowed values are:
    <ul>
      <li><code>infinity</code></li>
      <li>an arbitrary <a href="/en-US/docs/MathML/Attributes/Values#Lengths">length</a></li>
    </ul>
  </dd>
  <dt id="attr-movablelimits">
    movablelimits</dt>
  <dd>
    Specifies whether attached under- and overscripts move to sub- and superscript positions when <strong>displaystyle</strong> is <code>false</code>.<br />
    Allowed values are either <code>true</code> or <code>false.</code></dd>
  <dt id="attr-rspace">
    rspace</dt>
  <dd>
    The amount of space after the operator (see <a href="/en-US/docs/MathML/Attributes/Values#Lengths">length</a> for values and units). The constant <code>thickmathspace</code> (5/18em) is the default value.</dd>
  <dt id="attr-separator">
    separator</dt>
  <dd>
    There is no visual effect for this attribute, but it specifies whether the operator is a separator (such as commas).<br />
    Allowed values are <code>true</code> or <code>false</code>.</dd>
  <dt id="attr-stretchy">
    stretchy</dt>
  <dd>
    Specifies whether the operator stretches to the size of the adjacent element.<br />
    Allowed values are <code>true</code> or <code>false</code>.</dd>
  <dt id="attr-symmetric">
    symmetric</dt>
  <dd>
    If <strong>stretchy</strong> is <code>true</code>, this attribute specifies whether the operator should be vertically symmetric around the imaginary math axis (centered fraction line).<br />
    The default value is <code>true</code> if <strong>stretchy</strong> is set to <code>true</code> and otherwise <code>false</code>. Allowed values are <code>true</code> or <code>false</code>.</dd>
</dl>
<h2 id="Examples">Examples</h2>
<pre class="brush: html">
&lt;math&gt;

&lt;mrow&gt;
&nbsp; &lt;mn&gt;5&lt;/mn&gt;
&nbsp; &lt;mo&gt;+&lt;/mo&gt;
&nbsp; &lt;mn&gt;5&lt;/mn&gt;
&lt;/mrow&gt; 

&lt;mrow&gt;
  &lt;mo&gt; [ &lt;/mo&gt; &lt;!-- default form value: prefix --&gt; 
&nbsp; &lt;mrow&gt;
    &lt;mn&gt; 0 &lt;/mn&gt;
    &lt;mo&gt; ; &lt;/mo&gt; &lt;!-- default form value: infix --&gt; 
&nbsp;&nbsp;&nbsp; &lt;mn&gt; 1 &lt;/mn&gt;
  &lt;/mrow&gt;
  &lt;mo&gt; ) &lt;/mo&gt; &lt;!-- default form value: postfix --&gt;
&lt;/mrow&gt;

&lt;/math&gt;
</pre>
<h2 id="Browser_compatibility">Browser compatibility</h2>
<p>{{ CompatibilityTable() }}</p>
<div id="compat-desktop">
  <table class="compat-table">
    <tbody>
      <tr>
        <th>Feature</th>
        <th>Chrome</th>
        <th>Firefox (Gecko)</th>
        <th>Internet Explorer</th>
        <th>Opera</th>
        <th>Safari</th>
      </tr>
      <tr>
        <td>Basic support</td>
        <td>{{ CompatNo() }} (24 only)</td>
        <td>{{ CompatGeckoDesktop("1.0") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>9.5</td>
        <td>5.1</td>
      </tr>
      <tr>
        <td><code>accent</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoDesktop("1.0") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>dir</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoDesktop("12.0") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>form</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }} {{ bug("562460") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>9.5</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>href</code></td>
        <td>{{ CompatNo() }} {{webkitbug(85733)}}</td>
        <td>{{ CompatGeckoDesktop("7.0") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }} {{webkitbug(85733)}}</td>
      </tr>
      <tr>
        <td><code>largeop</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>9.5</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>lspace, rspace</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoDesktop("1.0") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>mathsize</code></td>
        <td>{{ CompatNo() }} (24 only)</td>
        <td>{{ CompatGeckoDesktop("1.0") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>5.1</td>
      </tr>
      <tr>
        <td><code>mathvariant</code></td>
        <td>{{ CompatNo() }} (24 only)</td>
        <td>partially supported (see above)</td>
        <td>{{ CompatNo() }}</td>
        <td>partially supported (see above)</td>
        <td>partially supported (see above)</td>
      </tr>
      <tr>
        <td><code>maxsize, minsize</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoDesktop("1.0") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>movablelimits</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoDesktop("1.0") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>stretchy</code></td>
        <td>{{ CompatNo() }} (24 only)</td>
        <td>{{ CompatGeckoDesktop("1.0") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>5.1</td>
      </tr>
      <tr>
        <td><code>symmetric</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoDesktop("1.0") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
    </tbody>
  </table>
</div>
<div id="compat-mobile">
  <table class="compat-table">
    <tbody>
      <tr>
        <th>Feature</th>
        <th>Android</th>
        <th>Chrome for Android</th>
        <th>Firefox Mobile (Gecko)</th>
        <th>IE Mobile</th>
        <th>Opera Mobile</th>
        <th>Safari Mobile</th>
      </tr>
      <tr>
        <td>Basic support</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoMobile("1.9.2") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>accent</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoMobile("1.9.2") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>dir</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoMobile("12.0") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>form</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }} {{ bug("562460") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>href</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoMobile("7.0") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>largeop</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>lspace, rspace</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoMobile("1.9.2") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>mathsize</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoMobile("1.9.2") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>mathvariant</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>partially supported (see above)</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>maxsize, minsize</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoMobile("1.9.2") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>movablelimits</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoMobile("1.9.2") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>stretchy</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoMobile("1.9.2") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
      <tr>
        <td><code>symmetric</code></td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoMobile("1.9.2") }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
    </tbody>
  </table>
</div>
<div class="note">
  <strong>Note:</strong> Any <a class="external" href="http://www.w3.org/TR/MathML3/chapter3.html#presm.lbattrs" title="http://www.w3.org/TR/MathML3/chapter3.html#presm.lbattrs">linebreaking</a> or <a class="external" href="http://www.w3.org/TR/MathML3/chapter3.html#presm.lbindent.attrs" title="http://www.w3.org/TR/MathML3/chapter3.html#presm.lbindent.attrs">indentation attributes</a> are not implemented yet. For Gecko see {{ bug("534962") }}.</div>
<h3 id="Gecko-specific_notes">Gecko-specific notes</h3>
<ul>
  <li>Starting with Gecko 16.0 {{ geckoRelease("16.0") }} the default values for <code>lspace</code> and <code>rspace</code> have been corrected to match the MathML3 specification. They now default to the constant <code>thickmathspace</code> (5/18em).</li>
  <li>Starting with Gecko 20.0 {{geckoRelease("20.0")}} a unitless value for <code>mathsize</code> is allowed.</li>
</ul>
<h2 id="Specifications" name="Specifications">Specifications</h2>
<table class="standard-table" height="49" width="1000">
  <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.mo', 'mo') }}</td>
      <td>{{ Spec2('MathML3') }}</td>
      <td>Current specification</td>
    </tr>
    <tr>
      <td>{{ SpecName('MathML2', 'chapter3.html#presm.mo', 'mo') }}</td>
      <td>{{ Spec2('MathML2') }}</td>
      <td>Initial specification</td>
    </tr>
  </tbody>
</table>
<p>&nbsp;</p>
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