负值，请注意动画跳过 2 秒进入动画周期 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <style>
    div {
      width: 100px;
      height: 100px;
      background: red;
      position: relative;
      animation: mymove 5s infinite;
      animation-delay: -2s;

      /*Safari 和 Chrome*/
      -webkit-animation: mymove 5s infinite;
      -webkit-animation-delay: -2s;
    }

    @keyframes mymove {
      from {
        left: 0px;
      }
      to {
        left: 200px;
      }
    }

    @-webkit-keyframes mymove
    /*Safari 和 Chrome*/

    {
      from {
        left: 0px;
      }
      to {
        left: 200px;
      }
    }
  </style>
</head>
<body>

  <p><strong>注意:</strong>animation-delay 属性不兼容 Internet Explorer 9以及更早版本的浏览器。</p>

  <div></div>

</body>
</html>
        