层叠性-复杂选择器权重计算

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* 
            权重(2, 0, 1)
         */
        #box1 #box2 p {
            color: red;
        }

        /* 
            权重(2, 1, 2)
         */
        #box1 div.box2 #box3 p {
            color: green;
        }

        /* 
            权重(0, 3, 1)
         */
        .box1 .box2 .box3 p {
            color: blue;
        }


        /* 
            权重(0, 1, 1)
         */
        .list li {
            color: red;
        }
        /* 
            权重(0, 1, 0)
         */
        .spec {
            color: blue !important;
        }
    </style>
</head>

<body>
    <div id="box1" class="box1">
        <div id="box2" class="box2">
            <div id="box3" class="box3">
                <p>我是段落</p>
            </div>
        </div>
    </div>

    <ul class="list">
        <li>列表项</li>
        <li class="spec">列表项</li>
        <li class="spec">列表项</li>
        <li>列表项</li>
        <li>列表项</li>
        <li>列表项</li>
        <li>列表项</li>
    </ul>
</body>

</html>
CSS

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