css换行处理

p {    position:relative;    line-height:1.4em;    /* 3 times the line-height to show 3 lines */    height:4.2em;    overflow:hidden;}p::after {    content:"...";    font-weight:bold;    position:absolute;    bottom:0;    right:0;    padding:0 20px 1px 45px;    background:url(http://css88.b0.upaiyun.com/css88/2014/09/ellipsis_bg.png) repeat-y;}