隐藏一个旋转的 div 元素的背面 - 在线编辑器

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <style>
    div {
      width: 100px;
      height: 100px;
      background: red;
      color: white;
      -webkit-animation: mymove 2s infinite linear alternate;
      /* Chrome、Safari、Opera */
      animation: mymove 2s infinite linear alternate;
    }
    /* Chrome、Safari、Opera */

    @-webkit-keyframes mymove {
      to {
        -webkit-transform: rotateY(180deg);
      }
    }

    @keyframes mymove {
      to {
        transform: rotateY(180deg);
      }
    }
  </style>
</head>
<body>

  <p>勾选/取消勾选复选框，来改变旋转的 DIV 元素的 backface-visibility：</p>
  <div id="myDIV">
    <h1>Hello</h1>
  </div>
  <input type="checkbox" onclick="myFunction(this)" checked>backface-visibility
  <script>
    function myFunction(x) {
      if (x.checked === true) {
        document.getElementById("myDIV").style.backfaceVisibility = "visible";
        document.getElementById("myDIV").style.WebkitBackfaceVisibility = "visible"; // 针对 Chrome、Safari、Opera 的代码
      } else {
        document.getElementById("myDIV").style.backfaceVisibility = "hidden";
        document.getElementById("myDIV").style.WebkitBackfaceVisibility = "hidden"; // 针对 Chrome、Safari、Opera 的代码
      }
    }
  </script>
  <p><strong>注意：</strong>Internet Explorer 9 及其之前的版本不支持 backface-visibility 属性。</p>

</body>
</html>
​x
 
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <style>
    div {
      width: 100px;
      height: 100px;
      background: red;
      color: white;
      -webkit-animation: mymove 2s infinite linear alternate;
      /* Chrome、Safari、Opera */
      animation: mymove 2s infinite linear alternate;
    }
    /* Chrome、Safari、Opera */
​
    @-webkit-keyframes mymove {
      to {
        -webkit-transform: rotateY(180deg);
      }
    }
​
    @keyframes mymove {