What does "{%" do in HTML?
<p>I've added Django messages to my app using the official documentation. In it it says to add something like this to my template:</p>

<pre><code>{% if messages %}
&lt;ul class="messages"&gt;
    {% for message in messages %}
    &lt;li{% if message.tags %} class="{{ message.tags }}"{% endif %}&gt;{{ message }}&lt;/li&gt;
    {% endfor %}
&lt;/ul&gt;
{% endif %}
</code></pre>

<p>I have no idea what the percentage signs do, they're not actual HTML right? </p>