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caret彻底的理解css的三角形【通过border】

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
        .caret0{
            width:0;
            height:0;
            border: 5px solid #000;
        }
        .caret1{
            width:0;
            height:0;
            border-top: 5px solid #000;
            border-left: 5px solid #fff;
            border-right: 5px solid #fff;
            border-bottom: 5px solid #000;
        }
        .caret2{
            width:0;
            height:0;
            border-top: 5px solid #fff;
            border-left: 5px solid #f00;
            border-right: 5px solid #f00;
            border-bottom: 5px solid #fff;
        }
        .caret2{
            width:0;
            height:0;
            border-top: 5px solid #fff;
            border-left: 5px solid #f00;
            border-right: 5px solid #f00;
            border-bottom: 5px solid #fff;
        }
        .caret3{
            width:0px;
            height: 0px;
            border-bottom: 5px solid #000;
            border-left: 5px solid transparent;
            border-right: 5px solid transparent;
        }
        .caret4{
            width:0px;
            height: 0px;
            border-right: 5px solid #000;
            border-top: 5px solid transparent;
            border-bottom: 5px solid transparent;
        }
        .caret5{
            width:0px;
            height: 0px;
            border-top: 5px solid #000;
            border-left: 5px solid transparent;
            border-right: 5px solid transparent;
        }
        .caret6{
            width:0px;
            height: 0px;
            border-left: 5px solid #000;
            border-top: 5px solid transparent;
            border-bottom: 5px solid transparent;
        }
    </style>
</head>
<body>
<h1>通过border的设置的三角形</h1>
<div class="caret0"></div>
<div class="caret1"></div>
<br>
<div class="caret0"></div>
<br>
<div class="caret1"></div>
<br>
<div class="caret2"></div>
<br>
向上的三角形
<div class="caret3"></div>
<br>
向左的三角形
<div class="caret4"></div>
<br>
向下的三角形
<div class="caret5"></div>
<br>
向右的三角形
<div class="caret6"></div>
</body>
</html>

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原文地址：https://www.cnblogs.com/lee90/p/5809313.html