css3实现点圈旋转的loading效果

test.html
<!doctype html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="Generator" content="EditPlus®">
    <meta name="Author" content="">
    <meta name="Keywords" content="">
    <meta name="Description" content="">
    <title>Document</title>
    <style type="text/css">
        div {
            margin: 100px auto;
            width: 2px;
            height: 2px;
            border-radius: 1px;
            box-shadow: 0 -12px 0 3px black, /*上*/
            0 12px 0 1px #333, /*下*/
            -12px 0 0 1px #333, /*左*/
            12px 0 0 1px #333, /*右*/
            -9px -9px 0 1px #333, /*左上*/
            9px -9px 0 2px #333, /*右上*/
            -9px 9px 0 1px #333, /*左下*/
            9px 9px 0 1px #333/*右下*/
            ;
            animation: loading 2s linear 0s infinite;
            -webkit-animation: loading 2s linear 0s infinite;
            -o-animation: loading 2s linear 0s infinite;
            -moz-animation: loading 2s linear 0s infinite;
        }
        
        @keyframes loading {
            from {
                transform: rotate(0deg);
            }
            to {
                transform: rotate(360deg);
            }
        }
        
        @-webkit-keyframes loading {
            from {
                -webkit-transform: rotate(0deg);
            }
            to {
                -webkit-transform: rotate(360deg);
            }
        }
        
        @-o-keyframes loading {
            from {
                -o-transform: rotate(0deg);
            }
            to {
                -o-transform: rotate(360deg);
            }
        }
        
        @-moz-keyframes loading {
            from {
                -moz-transform: rotate(0deg);
            }
            to {
                -moz-transform: rotate(360deg);
            }
        }
    </style>
</head>

<body>
    <div id="loading"></div>
</body>

</html>
css3实现点圈旋转的loading效果

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