[ Css实现梯形Tab标签 ]
实现效果：
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<div class="box">
<ul>
<li>aaaa</li>
<li>bbbb</li>
<li>cccc</li>
<li>dddd</li>
</ul>
</div>
</body>
<style>
*{padding:0;margin:0}
ul{margin:100px;height:20px;list-style:none;padding-left:20px}
li{text-align:center;width:50px;height:0;float:left;margin-left:-25px;border-width:0 20px 37px 27px;border-color:transparent transparent red;border-style:none solid solid}
ul li:first-child{margin-left:0}
</style>
</html>Css — Aug 17, 2017
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