// css3 .tag{ 300px; height:100px; border:1px solid #eee; position:relative; background-color:#FFF; top: 50px; } .tag:before,.tag:after{ content: ''; display: block; position: absolute; border- 10px; top: -20px; left: 160px; border-style: dashed dashed solid; border-color: transparent transparent #eee; font-size: 0; line-height: 0; } .tag:after{ top: -19px; border-color: transparent transparent #fff; }
// html
<div class="tag"> css3气泡框 </div>