display:none与visible:hidden的差异

display:none与visible:hidden的区别
<span style="visibility:hidden; background-color:Blue">隐藏区域</span><span style="background-color:Green">显示区域</span>
</body>
</html>

from : http://www.cnblogs.com/nicholas_f/archive/2009/03/27/1423207.html