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              div.box
  h1 this
  h2 is
  p a test
  h4 of
  span dynamic
  h5 font
  h6 sizing
            
          
!
            
              body
  background-color: black
  color: white

.box
  padding: 0
  width: 320px
  margin: 0 auto
  border: 5px solid white
  text-align: center
  text-transform: uppercase
  
  *
    width: auto
    margin: 0
    display: inline-block
    white-space: nowrap
 
            
          
!
            
              var $box = $('.box'),
    $items = $box.find('*');

for( $item in $items ){
  var $text = $( $items[$item] ),
      fontSize = 14,
      changes = 0,
      success = true;

  while( $text.width() <= $box.width() ){
    $text.css( 'font-size', fontSize + 'px');
    fontSize++;
    changes++;
    
    if (changes > 500) {
      success = false;
      break;
    }
  }
  
  if( changes > 0 ) {
    if( success ){
      fontSize -= 2;
    }else{
      fontSize -= changes;
      $text.css('font-size', fontSize + 'px');
    }
  }
}
            
          
!
999px
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