<!DOCTYPE html>
<html>
<head>
<style>
img {
clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
}
</style>
</head>
<body>
<h1>polygon() 函数</h1>
<img src="/i/photo/tulip.jpg" alt="Tulip" width="300" height="300">
</body>
</html>