title: How do I change my code to avoid warning "should trim empty <div>" in Aptana Studio?
body: <p>I use 'class' when I need CSS function. For example, when I want to use clear: left;
  I make a class <code>.clear {clear: left;}</code> and use it in HTML file.</p>
  
  <p>But there is always the warning</p>
  
  <blockquote>
    <p>should trim empty </p>
  </blockquote>
  
  <p>Luckily, it's not error so I don't care greatly. But it bother me sometimes.</p>
  
  <p>Is there any solution sticking my habit?</p>