how bad is it to use empty div and is there a difference between empty div and span as block elements? : <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>
