How to set container height to 1px in IE6
If you use clearfix class to clear floated elements throughout your site, you might have been faced with a large gap in IE6 browser, even if you specified 1px height property, like so:
.clearfix { clear:both; height:1px; }
There is a very simple solution for this problem - just add the line-height property.
.clearfix { clear:both; height:1px; line-height:1px; }