title: What kind of tools / generator are used for shortening css class selector?
body: <p>I have come across this <a href="https://bootstrap-themes.github.io/application/profile/index.html" rel="nofollow noreferrer">bootstrap theme</a> and just wondering what tools are they using to simplify / shorten the class selector name?</p>
  
  <p>Instead of something like:</p>
  
  <pre><code>&lt;div class="row"&gt;
   &lt;div class="col-md-6"&gt;&lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>It's using:</p>
  
  <pre><code>&lt;div class="qx"&gt;
    &lt;div class="qv"&gt;&lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Thank you</p>