前端 CSS 经典：图层放大的 hover 效果

效果

思路

设置 3 层元素，最上层元素使用 clip-path 裁剪成圆，hover 改变圆大小，添加过渡效果。

实现代码

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta
      name="viewport"
      content="initial-scale=1.0, user-scalable=no, width=device-width"
    />
    <title>document</title>
    <style>
      body {
        background: #000;
      }

      .avatar {
        background: url(../../../images/demo/img.jpg);
        background-size: cover;
        height: 200px;
        width: 200px;
        border-radius: 50%;
        cursor: pointer;
        position: relative;
      }

      .avatar::after,
      .avatar::before {
        content: "";
        position: absolute;
        inset: 0;
        border-radius: 50%;
      }

      .avatar::before {
        background: rgba(0, 0, 0, 0.5);
      }

      .avatar::after {
        background: inherit;
        clip-path: circle(0% at 50% 50%);
        transition: 0.3s;
      }

      .avatar:hover::after {
        clip-path: circle(50% at 50% 50%);
      }
    </style>
  </head>
  <body>
    <div class="avatar"></div>
    <script></script>
  </body>
</html>