App下載
實(shí)例代碼( Tip: 登錄后體驗(yàn)更佳 )
<!DOCTYPE html>
<html>
<head>
    <style type="text/css">
        #redP p {
            /* 权值 = 100+1=101 */
            color:#F00;  /* 红色 */
        }
        #redP .red em {
            /* 权值 = 100+10+1=111 */
            color:#00F; /* 蓝色 */
        }
        #redP p span em {
            /* 权值 = 100+1+1+1=103 */
            color:#FF0;/*黄色*/
        }
    </style>
</head>
<body>
<div id="redP">
    <p class="red">red
        <span><em>em red</em></span>
    </p>
    <p>red</p>
</div>
</body>
</html>
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