04 body中的相关标签

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="content-Type" charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
</head>
<body>
    <!--语义化标签-->
    <!--u标签：underline下划线-->
    <u>小马哥</u>
    <!--b标签：粗体文本-->
    <b>小马哥</b>
    <!--em：斜体-->
    <em>小马哥</em>
    <!--上角标-->
    2<sup>3</sup>
    <!--下角标-->
    8<sub>4</sub>
</body>
</html>

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