层叠性

<!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>
        p {
            color: red;
        }

        .spec {
            font-style: italic;
        }

        #para {
            text-decoration: underline;
        }
    </style>
</head>

<body>
    <p id="para" class="spec">我是段落</p>
</body>

</html>

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CSS

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