<!DOCTYPE html>
<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>css半圆弧线</title>
    <style type="text/css">
          .circle1 {
            width: 100px;
            height: 200px;
            border: 1px solid black;
            border-radius: 100% 0 0 100%/50%;
            border-right: none;
        }
        .circle2 {
            width: 200px;
            height: 100px;
            border: 1px solid black;
            border-radius: 50% 50% 0 0/100% 100% 0 0;
            border-bottom: none;
        }
        .circle3 {
            width: 100px;
            height: 200px;
            border: 1px solid black;
            border-radius: 0 100% 100% 0/50%;
            border-left: none;
        }
        .circle4 {
            width: 200px;
            height: 100px;
            border: 1px solid black;
            border-radius: 0 0 50% 50%/0 0 100% 100% ;
            border-top: none;
        }
    </style>
</head>
<body>
        <ul>
            <li><div class="circle1"></div></li>
            <li><div class="circle2"></div></li>
            <li><div class="circle3"></div></li>
            <li><div class="circle4"></div></li>
        </ul>
</body>
</html>

css3 半圆弧线

css半圆弧线

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