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高洛峰2017-04-17 11:35:16
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta charset="utf-8" />
<title>Tab Style</title>
<style>
p {width:112px;height:32px;float:left;position:relative;overflow:hidden;}
p:before {content:'';background:#9f9f9f;width:32px;height:32px;transform:rotate(-45deg);position:absolute;left:6px;border-radius:2px;}
p:after {content:'';background:#9f9f9f;width:96px;height:32px;position:absolute;right:0;border-radius:3px;}
p > i {width:8px;height:8px;background:#fff;border-radius:50%;position:absolute;top:50%;margin-top:-4px;left:8px;}
</style>
</head>
<body>
<p><i></i></p>
</body>
</html>update 2017.02.07
有同学在问圆点透明的问题，如果仔细阅读style就能发现原点是由i标签来呈现的，只要将i标签的背景色改成rgba就可以达到目的。
p > i {width:8px;height:8px;background:rgba(255,255,255,.3);border-radius:50%;position:absolute;top:50%;margin-top:-4px;left:8px;}
阿神2017-04-17 11:35:16
正在学习前端。尝试做一下。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>CSS画标签</title>
<link rel="stylesheet" href="">
<style>
.content{
width:150px;
height:50px;
position:relative;
left:200px;
background-color: #ccc;
border-radius:0 5px 5px 0;
}
.angel{
position: absolute;
width:0;
height:0;
border-top: 25px solid transparent;
border-bottom:25px solid transparent;
border-right:25px solid #ccc;
left:-25px;
}
.circle{
background-color: #fff;
height:10px;
width:10px;
border-radius: 50%;
position:absolute;
top:20px;
}
</style>
</head>
<body>
<p class="content">
<p class="angel"></p>
<p class="circle"></p>
</p>
</body>
</html>