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  <div class="section" id="the-safe-extension">
<span id="configure-safe"></span><h1>The Safe extension<a class="headerlink" href="#the-safe-extension" title="Permalink to this headline"></a></h1>
<p>The options below control the operation of the <cite>Safe</cite> extension that
is run when you include <code class="docutils literal"><span class="pre">&quot;Safe.js&quot;</span></code> in the <cite>extensions</cite> array of
your configuration, or include <code class="docutils literal"><span class="pre">Safe</span></code> in the <code class="docutils literal"><span class="pre">config=</span></code> options
when you load <code class="docutils literal"><span class="pre">MathJax.js</span></code>.  They are listed with their default
values.  To set any of these options, include a <code class="docutils literal"><span class="pre">Safe</span></code>
section in your <code class="xref py py-meth docutils literal"><span class="pre">MathJax.Hub.Config()</span></code> call.  For example</p>
<div class="highlight-javascript"><div class="highlight"><pre><span></span><span class="nx">MathJax</span><span class="p">.</span><span class="nx">Hub</span><span class="p">.</span><span class="nx">Config</span><span class="p">({</span>
  <span class="nx">Safe</span><span class="o">:</span> <span class="p">{</span>
    <span class="nx">allow</span><span class="o">:</span> <span class="p">{</span>
      <span class="nx">URLs</span><span class="o">:</span> <span class="s2">&quot;safe&quot;</span><span class="p">,</span>
      <span class="nx">classes</span><span class="o">:</span> <span class="s2">&quot;safe&quot;</span><span class="p">,</span>
      <span class="nx">cssIDs</span><span class="o">:</span> <span class="s2">&quot;safe&quot;</span><span class="p">,</span>
      <span class="nx">styles</span><span class="o">:</span> <span class="s2">&quot;safe&quot;</span><span class="p">,</span>
      <span class="nx">fontsize</span><span class="o">:</span> <span class="s2">&quot;all&quot;</span><span class="p">,</span>
      <span class="nx">require</span><span class="o">:</span> <span class="s2">&quot;safe&quot;</span>
    <span class="p">}</span>
  <span class="p">}</span>
<span class="p">});</span>
</pre></div>
</div>
<p>would set the <code class="docutils literal"><span class="pre">fontsize</span></code> option to <code class="docutils literal"><span class="pre">&quot;all&quot;</span></code>, and the others to
<code class="docutils literal"><span class="pre">&quot;safe&quot;</span></code> (these are described below).</p>
<p>The Safe extension affects both the TeX input and MathML input jax.</p>
<dl class="describe">
<dt>
<code class="descname">allow: { ... }</code></dt>
<dd><p>This block contains the flags that control what the Safe extension
will allow, and what it will block.  The flags can be set to
<code class="docutils literal"><span class="pre">&quot;all&quot;</span></code>, <code class="docutils literal"><span class="pre">&quot;none&quot;</span></code>, or <code class="docutils literal"><span class="pre">&quot;safe&quot;</span></code>.  When set to <code class="docutils literal"><span class="pre">&quot;all&quot;</span></code>, no
filtering is done for these values (this gives MathJax’s default
behavior).  When set to <code class="docutils literal"><span class="pre">&quot;none&quot;</span></code>, these values are always
filtered out.  When set to <code class="docutils literal"><span class="pre">&quot;safe&quot;</span></code>, then only some values are
allowed, as described below.</p>
<dl class="describe">
<dt>
<code class="descname">URLs: &quot;safe&quot;</code></dt>
<dd><p>When set to <code class="docutils literal"><span class="pre">&quot;safe&quot;</span></code> only URL’s with protocols that are
listed in the <code class="docutils literal"><span class="pre">safeProtocols</span></code> property (see below) are
allowed as targets of <code class="docutils literal"><span class="pre">href</span></code> attributes or the <code class="docutils literal"><span class="pre">\href</span></code>
macro.  By default, these are <code class="docutils literal"><span class="pre">http://</span></code>, <code class="docutils literal"><span class="pre">https://</span></code>, and
<code class="docutils literal"><span class="pre">file://</span></code> URL’s.</p>
</dd></dl>

<dl class="describe">
<dt>
<code class="descname">classes: &quot;safe&quot;</code></dt>
<dd><p>When set to <code class="docutils literal"><span class="pre">&quot;safe&quot;</span></code>, only class names that begin with
<code class="docutils literal"><span class="pre">MJX-</span></code> and contain only letters, numbers, or the characters
<code class="docutils literal"><span class="pre">-</span></code>, <code class="docutils literal"><span class="pre">_</span></code>, or <code class="docutils literal"><span class="pre">.</span></code> are allowed.</p>
</dd></dl>

<dl class="describe">
<dt>
<code class="descname">cssIDs: &quot;safe&quot;</code></dt>
<dd><p>When set to <code class="docutils literal"><span class="pre">&quot;safe&quot;</span></code>, only ID’s that begin with
<code class="docutils literal"><span class="pre">MJX-</span></code> and contain only letters, numbers, or the characters
<code class="docutils literal"><span class="pre">-</span></code>, <code class="docutils literal"><span class="pre">_</span></code>, or <code class="docutils literal"><span class="pre">.</span></code> are allowed.</p>
</dd></dl>

<dl class="describe">
<dt>
<code class="descname">styles: &quot;safe&quot;</code></dt>
<dd><p>When set to <code class="docutils literal"><span class="pre">&quot;safe&quot;</span></code>, only styles taken from a predefined
set of styles are allowed to be given.  These are listed in
the <code class="docutils literal"><span class="pre">safeStyles</span></code> property (see below).</p>
</dd></dl>

<dl class="describe">
<dt>
<code class="descname">require: &quot;safe&quot;</code></dt>
<dd><p>When set to <code class="docutils literal"><span class="pre">&quot;safe&quot;</span></code>, only the extensions listed in the
<code class="docutils literal"><span class="pre">safeRequire</span></code> property (see below) are allowed to be loaded
by the <code class="docutils literal"><span class="pre">\require{}</span></code> macro.</p>
</dd></dl>

<dl class="describe">
<dt>
<code class="descname">fontsize: &quot;all&quot;</code></dt>
<dd><p>When set to <code class="docutils literal"><span class="pre">&quot;safe&quot;</span></code>, MathJax will try to limit the font size
to sizes between those given by the <code class="docutils literal"><span class="pre">sizeMin</span></code> and <code class="docutils literal"><span class="pre">sizeMax</span></code>
properties.  These are .7 and 1.44 by default, which means
sizes between <code class="docutils literal"><span class="pre">\scriptsize</span></code> and <code class="docutils literal"><span class="pre">\large</span></code> are allowed.  This
also filters MathML <code class="docutils literal"><span class="pre">fontsize</span></code>, <code class="docutils literal"><span class="pre">mathsize</span></code>, and
<code class="docutils literal"><span class="pre">scriptminsize</span></code> attributes, but here, <code class="docutils literal"><span class="pre">&quot;safe&quot;</span></code> acts as
<code class="docutils literal"><span class="pre">&quot;none&quot;</span></code>, since they are given in sizes with units, and the
actual size of the units is not determined at input time (it is
part of the output processing).  In addition, the
<code class="docutils literal"><span class="pre">scriptlevel</span></code> attribute is restricted to non-negative values
(so scripts can’t be made larger), and the
<code class="docutils literal"><span class="pre">scriptsizemultiplier</span></code> is restricted to being no larger than
1, and no less than .6.</p>
</dd></dl>

</dd></dl>

<dl class="describe">
<dt>
<code class="descname">sizeMin: .7</code></dt>
<dd><p>This is the minimum font size (in em’s) that the TeX input jax
will allow when <code class="docutils literal"><span class="pre">fontsize</span></code> is set to <code class="docutils literal"><span class="pre">&quot;safe&quot;</span></code> above.  The
default is the size of <code class="docutils literal"><span class="pre">\scriptsize</span></code>.  Values less than this are
set to this value.</p>
</dd></dl>

<dl class="describe">
<dt>
<code class="descname">sizeMax: 1.44</code></dt>
<dd><p>This is the maximum font size (in em’s) that the TeX input jax
will allow when <code class="docutils literal"><span class="pre">fontsize</span></code> is set to <code class="docutils literal"><span class="pre">&quot;safe&quot;</span></code> above.  The
default is the size of <code class="docutils literal"><span class="pre">\large</span></code>.  Values larger than this are
set to this value.</p>
</dd></dl>

<dl class="describe">
<dt>
<code class="descname">safeProtocols: {...}</code></dt>
<dd><p>This is an object that lists the protocols that can be used in
<code class="docutils literal"><span class="pre">href</span></code> attributes and the <code class="docutils literal"><span class="pre">\href</span></code> macro when <code class="docutils literal"><span class="pre">URLs</span></code> is set
to <code class="docutils literal"><span class="pre">&quot;safe&quot;</span></code> above.  The default is</p>
<div class="highlight-javascript"><div class="highlight"><pre><span></span><span class="nx">safeProtocols</span><span class="o">:</span> <span class="p">{</span>
  <span class="nx">http</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">https</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">file</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">javascript</span><span class="o">:</span> <span class="kc">false</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Note that if a protocol doesn’t appear in the list, it is assumed
to be <code class="docutils literal"><span class="pre">false</span></code>, so technically, <code class="docutils literal"><span class="pre">javascript</span></code> need not have been
listed, but it is given to make it explicit that it should not be
allowed.</p>
</dd></dl>

<dl class="describe">
<dt>
<code class="descname">safeStyles: {...}</code></dt>
<dd><p>This is an object that lists the style properties that can be used
in MathML <code class="docutils literal"><span class="pre">style</span></code> attributes and the <code class="docutils literal"><span class="pre">\style</span></code> and <code class="docutils literal"><span class="pre">\bbox</span></code>
macros when <code class="docutils literal"><span class="pre">styles</span></code> is set to <code class="docutils literal"><span class="pre">&quot;safe&quot;</span></code> in the <code class="docutils literal"><span class="pre">allowed</span></code>
property above.  The default is</p>
<div class="highlight-javascript"><div class="highlight"><pre><span></span><span class="nx">safeStyles</span><span class="o">:</span> <span class="p">{</span>
  <span class="nx">color</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">backgroundColor</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">border</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">cursor</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">margin</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">padding</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">textShadow</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">fontFamily</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">fontSize</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">fontStyle</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">fontWeight</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">opacity</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">outline</span><span class="o">:</span> <span class="kc">true</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Any style property that doesn’t appear on this list is not allowed
to be entered and will be removed (silently) from the style
definition.</p>
</dd></dl>

<dl class="describe">
<dt>
<code class="descname">safeRequire: {...}</code></dt>
<dd><p>This is an object that lists the TeX extensions that can be loaded
via the <code class="docutils literal"><span class="pre">\require{}</span></code> macro when <code class="docutils literal"><span class="pre">require</span></code> is set to
<code class="docutils literal"><span class="pre">&quot;safe&quot;</span></code> in the <code class="docutils literal"><span class="pre">allowed</span></code> property above.  The default is</p>
<div class="highlight-javascript"><div class="highlight"><pre><span></span><span class="nx">safeRequire</span><span class="o">:</span> <span class="p">{</span>
  <span class="nx">action</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">amscd</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">amsmath</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">amssymbols</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">autobold</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span>
  <span class="s2">&quot;autoload-all&quot;</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span>
  <span class="nx">bbox</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">begingroup</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">boldsymbol</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">cancel</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">color</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">enclose</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">extpfeil</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">HTML</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">mathchoice</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">mhchem</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">newcommand</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">noErrors</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span>
  <span class="nx">noUndefined</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span>
  <span class="nx">unicode</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
  <span class="nx">verb</span><span class="o">:</span> <span class="kc">true</span>
<span class="p">}</span>
</pre></div>
</div>
</dd></dl>

<p>These configuration options give you a lot of control over what
actions MathJax is allowed to take.  It is also possible override the
individual filtering functions in order to customize the filtering
even further, should that be needed.  See the code for the details of
the function names and their definitions.</p>
</div>


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