title: Remove some classes from <style> tag in javascript
body: <p>I have a textarea wher there is some html like:</p>
  
  <pre><code>&lt;style&gt;
          a,
          body {
              color: #000
          }
  
          .test-row-1,
  ...
  &lt;/style&gt;
  &lt;div class="page-container"&gt;
  ...
  &lt;/div&gt;
  </code></pre>
  
  <p>In javascript I need to cycle on all elements inside "style" tag in order to do some stuff. 
  Finally I need to create another "style" with only some of the classes inside the original one.
  In the example I need to remove body class.</p>
  
  <p>Is this possible?</p>
  
  <p>thanks</p>