title: how bad is it to use empty div and is there a difference between empty div and span as block elements?
body: <p>Well, as the title says: is it consider as bad practice to use empty divs to style the page? of course if it's performance wise(instead of using images for example).</p>
  
  <p>And second question is: is there any difference between div(as block element) and span(as block element) in any term of performance or anything else?</p>
  
  <p>Thanks.</p>