宽高不确定时自定义边框
效果：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>border-image-slice</title>
<style>
.arrow {
border-image-source: url('./img/arrow.png');
border-image-slice: 23 13 23 13 fill;
border-top: 23px solid;
border-right: 13px solid;
border-bottom: 23px solid;
border-left: 13px solid;
/* 宽高可以随便修改 */
height: 500px;
width: 26px;
}
</style>
</head>
<!-- 类似点9图，宽高不确定时自定义边框 -->
<body>
<div class="arrow"></div>
</body>
</html>
标签：slice,自定义,solid,image,宽高,border From： https://www.cnblogs.com/ximu1009/p/17926286.html