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<div class="section" id="the-fontwarnings-extension">
<span id="configure-fontwarnings"></span><h1>The FontWarnings extension<a class="headerlink" href="#the-fontwarnings-extension" title="Permalink to this headline">¶</a></h1>
<p>The options below control the operation of the <cite>FontWarnings</cite>
extension that is run when you include <code class="docutils literal"><span class="pre">"FontWarnings.js"</span></code> in the
<cite>extensions</cite> array of your configuration. They are listed with their
default values. To set any of these options, include a
<code class="docutils literal"><span class="pre">FontWarnings</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">FontWarnings</span><span class="o">:</span> <span class="p">{</span>
<span class="nx">fadeoutTime</span><span class="o">:</span> <span class="mi">2</span><span class="o">*</span><span class="mi">1000</span>
<span class="p">}</span>
<span class="p">});</span>
</pre></div>
</div>
<p>would set the <code class="docutils literal"><span class="pre">fadeoutTime</span></code> option to 2000 milliseconds (2 seconds).</p>
<dl class="describe">
<dt>
<code class="descname">messageStyle: { ... }</code></dt>
<dd><p>This sets the CSS styles to be used for the font warning message
window. See the <code class="docutils literal"><span class="pre">extensions/FontWarnings.js</span></code> file for details of
what are set by default. See the <a class="reference internal" href="../../reference/CSS-styles.html#css-style-objects"><span class="std std-ref">CSS style objects</span></a> for details about how to specify CSS styles
via javascript objects.</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">Message: { ... }</code></dt>
<dd><p>This block contains HTML snippets to be used for the various
messages that the FontWarning extension can produce. There are
three messages that you can redefine to suit your needs:</p>
<dl class="describe">
<dt>
<code class="descname">webFont: [ ... ]</code></dt>
<dd><p>The message used for when MathJax uses web-based fonts (rather
than local fonts installed on the user’s system).</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">imageFonts: [ ... ]</code></dt>
<dd><p>The message used for when MathJax must use image fonts rather
than local or web-based fonts (for those browsers that don’t
handle the <code class="docutils literal"><span class="pre">@font-face</span></code> CSS directive).</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">noFonts: [ ... ]</code></dt>
<dd><p>The message used when MathJax is unable to find any font to use
(i.e., neither local nor web-based nor image-based fonts are
available).</p>
</dd></dl>
<p>Any message that is set to <code class="docutils literal"><span class="pre">null</span></code> rather than an HTML snippet
array will not be presented to the user, so you can set, for
example, the <code class="docutils literal"><span class="pre">webFont</span></code> message to <code class="docutils literal"><span class="pre">null</span></code> in order to have the
<code class="docutils literal"><span class="pre">imageFonts</span></code> and <code class="docutils literal"><span class="pre">noFonts</span></code> messages, but no message if MathJax
uses web-based fonts.</p>
<p>See the description of <a class="reference internal" href="../../reference/HTML-snippets.html#html-snippets"><span class="std std-ref">HTML snippets</span></a> for
details about how to describe the messages using HTML snippets.
Note that in addition to the usual rules for defining such
snippets, the FontWarnings snippets can include references to
pre-defined snippets (that represent elements common to all three
messages). These are defined below in the <code class="docutils literal"><span class="pre">HTML</span></code> block, and are
referenced using <code class="docutils literal"><span class="pre">["name"]</span></code> within the snippet, where <cite>name</cite> is
the name of one of the snippets defined in the <code class="docutils literal"><span class="pre">HTML</span></code>
configuration block. For example</p>
<div class="highlight-javascript"><div class="highlight"><pre><span></span><span class="nx">Message</span><span class="o">:</span> <span class="p">{</span>
<span class="nx">noFonts</span><span class="o">:</span> <span class="p">[</span>
<span class="p">[</span><span class="s2">"closeBox"</span><span class="p">],</span>
<span class="s2">"MathJax is unable to locate a font to use to display "</span><span class="p">,</span>
<span class="s2">"its mathematics, and image fonts are not available, so it "</span><span class="p">,</span>
<span class="s2">"is falling back on generic unicode characters in hopes that "</span><span class="p">,</span>
<span class="s2">"your browser will be able to display them. Some characters "</span><span class="p">,</span>
<span class="s2">"may not show up properly, or possibly not at all."</span><span class="p">,</span>
<span class="p">[</span><span class="s2">"fonts"</span><span class="p">],</span>
<span class="p">[</span><span class="s2">"webfonts"</span><span class="p">]</span>
<span class="p">]</span>
<span class="p">}</span>
</pre></div>
</div>
<p>refers to the <code class="docutils literal"><span class="pre">closeBox</span></code>, <code class="docutils literal"><span class="pre">fonts</span></code> and <code class="docutils literal"><span class="pre">webfonts</span></code> snippets
declared in the <code class="docutils literal"><span class="pre">HTML</span></code> section.</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">HTML: { ... }</code></dt>
<dd><p>This object defines HTML snippets that are common to more than one
message in the <code class="docutils literal"><span class="pre">Message</span></code> section above. They can be included in
other HTML snippets by by using <code class="docutils literal"><span class="pre">["name"]</span></code> in an HTML snippet,
where <cite>name</cite> refers to the name of the snippet in the <code class="docutils literal"><span class="pre">HTML</span></code>
block. The pre-defined snippets are:</p>
<dl class="describe">
<dt>
<code class="descname">closeBox</code></dt>
<dd><p>The HTML for the close box in the FontWarning message.</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">webfonts</code></dt>
<dd><p>The HTML for a paragraph suggesting an upgrade to a more
modern browser that supports web fonts.</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">fonts</code></dt>
<dd><p>HTML that includes links to the MathJax and STIX font download
pages.</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">STIXfonts</code></dt>
<dd><p>HTML that gives the download link for the STIX fonts only.
(Used in place of <cite>fonts</cite> when the <cite>HTML-CSS</cite> option for
<cite>availableFonts</cite> only includes the <a class="reference internal" href="../../reference/glossary.html#term-stix"><span class="xref std std-term">STIX</span></a> fonts.)</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">TeXfonts</code></dt>
<dd><p>HTML that gives the download link for the MathJax TeX fonts
only. (Used in place of <cite>fonts</cite> when the <cite>HTML-CSS</cite> option
for <cite>availableFonts</cite> only includes the <cite>TeX</cite> fonts.)</p>
</dd></dl>
<p>You can add your own pre-defined HTML snippets to this object, or
override the ones that are there with your own text.</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">removeAfter: 12*1000</code></dt>
<dd><p>This is the amount of time to show the FontWarning message, in
milliseconds. The default is 12 seconds. Setting this value
to zero means that the message will not fade out (the user must
close it manually).</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">fadeoutSteps: 10</code></dt>
<dd><p>This is the number of steps to take while fading out the
FontWarning message. More steps make for a smoother fade-out.
Set to zero to cause the message to be removed without fading.</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">fadeoutTime: 1.5*1000</code></dt>
<dd><p>This is the time used to perform the fade-out, in milliseconds.
The default is 1.5 seconds.</p>
</dd></dl>
</div>
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