title: Jinja 2 safe keyword
body: <p>I have a little problem understanding what an expression like <code>{{ something.render() | safe }}</code> does .</p>
  
  <p>From what I have seen, without the <code>safe</code> keyword it outputs the entire html document, not just the true content.</p>
  
  <p>What I would like to know, is what it actually does, how it functions .</p>