尝试一下》

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <style>
    #myDIV {
      width: 100px;
      height: 100px;
      background-color: coral;
      color: white;
      position: absolute;
      -webkit-animation: mymove 5s infinite;
      /* Chrome, Safari, Opera */
      animation: mymove 5s infinite;
    }
    /* Chrome, Safari, Opera */

    @-webkit-keyframes mymove {
      50% {
        clip: rect(0px, 50px, 50px, 0px);
      }
    }
    /* Standard syntax */

    @keyframes mymove {
      50% {
        clip: rect(0px, 50px, 50px, 0px);
      }
    }
  </style>
</head>
<body>

  <p>clip 属性支持动画效果, 但确无法达到预期效果。</p>
  <p><b>注意：</b>Internet Explorer 9 及更早 IE 版本不支持 CSS 动画。</p>

  <div id="myDIV">
    <h1>myDIV</h1>
  </div>

</body>
</html>
        
尝试一下 》
