><code>lang</code></li>
<li><code>dir</code>
<ul>
<li>Optional (text direction, like <code>ltr</code> or <code>rtl</code>)</li>
</ul></li>
<li><code>description-meta</code></li>
<li><code>title-prefix</code>
<ul>
<li>Optional, only affects <code>&lt;title&gt;</code> tag</li>
</ul></li>
<li><code>header-includes</code>
<ul>
<li>Optional. A list of strings to inject at the end of the <code>&lt;head&gt;</code> tag</li>
</ul></li>
<li><code>include-before</code>, <code>include-after</code>
<ul>
<li>Optional. A 