title: If div has a line-height of 0 and its only child, span, has line-height:0, where's the div's height coming from?
body: <p>Here's my doubt. I've got a parent div with a child which is a span. Both have line-height set to 0. The span has font-size set to many many pixels (198px).</p>
  
  <p>The problem: the div gets a height. But, from what, if it should come from the spans line-height, which is 0?</p>
  
  <p>I set up a tinkerbin. Check it out if if you're interested.</p>
  
  <p><a href="http://tinkerbin.com/0oCT7PRf" rel="nofollow">http://tinkerbin.com/0oCT7PRf</a></p>
  
  <p>This happens at least in firefox and chrome, so this is almost definitely a standardized behavior. </p>
  
  <p>Note!
  This is a css behavior doubt. I'm interested in knowing what's happening, not on "fixing" an "issue".</p>
  
  <p>Thanks in advance.</p>