css 实现对话气泡
HTNL ：
1 <div class="poptip"> 2 <span class="poptip-arrow poptip-arrow-top"><em>◆</em><i>◆</i></span> 3 <span class="poptip-arrow poptip-arrow-right"><em>◆</em><i>◆</i></span> 4 <span class="poptip-arrow poptip-arrow-bottom"><em>◆</em><i>◆</i></span> 5 <span class="poptip-arrow poptip-arrow-left"><em>◆</em><i>◆</i></span> 6 对话气泡 7</div>
CSS：
1 /* poptip */ 2 .poptip{position: absolute;top: 20px;left:20px;padding: 6px 10px 5px;*padding: 7px 10px 4px;line-height: 16px;color: #DB7C22;font-size: 12px;background-color: #FFFCEF;border: solid 1px #FFBB76;border-radius: 2px;box-shadow: 0 0 3px #ddd;} 3 .poptip-arrow{position: absolute;overflow: hidden;font-style: normal;font-family: simsun;font-size: 12px;text-shadow:0 0 2px #ccc;} 4 5 .poptip-arrow em,.poptip-arrow i{position: absolute;left:0;top:0;font-style: normal;} 6 .poptip-arrow em{color: #FFBB76;} 7 .poptip-arrow i{color: #FFFCEF;text-shadow:none;} 8 9 .poptip-arrow-top,.poptip-arrow-bottom{height: 6px;width: 12px;left:12px;margin-left:-6px;} 10 .poptip-arrow-left,.poptip-arrow-right{height: 12px;width: 6px;top: 12px;margin-top:-6px;} 11 12 .poptip-arrow-top{top: -6px;} 13 .poptip-arrow-top em{top: -1px;} 14 .poptip-arrow-top i{top: 0px;} 15 16 .poptip-arrow-bottom{bottom: -6px;} 17 .poptip-arrow-bottom em{top: -8px;} 18 .poptip-arrow-bottom i{top: -9px;} 19 20 .poptip-arrow-left{left:-6px;} 21 .poptip-arrow-left em{left:1px;} 22 .poptip-arrow-left i{left:2px;} 23 24 .poptip-arrow-right{right:-6px;} 25 .poptip-arrow-right em{left:-6px;} 26 .poptip-arrow-right i{left:-7px;}
摘抄（http://www.daqianduan.com/4518.html）
