pre标签实现自动换行

pre{ 
white-space:pre-wrap;/*css-3*/ 
white-space:-moz-pre-wrap;/*Mozilla,since1999*/ 
white-space:-pre-wrap;/*Opera4-6*/ 
white-space:-o-pre-wrap;/*Opera7*/ 
word-wrap:break-word;/*InternetExplorer5.5+*/　
width:120px;　
border:1px solid #e00;
float:left;
margin-left:10px;