title: Why doesn't this jquery selector with a period work
body: <p>I have a div with an ID</p>
  
  <pre><code>&lt;div id="updates-pane-user.followed_on"&gt;
  </code></pre>
  
  <p>this jquery selector works</p>
  
  <pre><code>$("[id^='updates-pane']")
  </code></pre>
  
  <p>but this doesn't</p>
  
  <pre><code>$("#updates-pane-user.followed_on")
  </code></pre>
  
  <p>I don't see what is wrong.. id names can include periods right? Am I missing something obvious?</p>