关于结构三标签

相关代码：

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <table border="1" cellspacing="0" cellpadding="10" align="left" width="70%">
        <caption>
            <h2>购物车</h2>
        </caption>
        <thead>
            <tr bgcolor="lightgray" align="center">
                <td></td>
                <th width="100">商品</th>
                <th>单价</th>
                <th>数量</th>
                <th>小计</th>

            </tr>
        </thead>

        <tbody>
            <tr>
                <td>1</td>
                <td>咖啡</td>
                <td>30</td>
                <td>2</td>
                <td>60</td>
            </tr>
            <tr>
                <td>2</td>
                <td>三文鱼</td>
                <td>199</td>
                <td>2</td>
                <td>398</td>
            </tr>
            <tr>
                <td>3</td>
                <td>鹅肝</td>
                <td>188</td>
                <td>1</td>
                <td>188</td>
            </tr>
            <tr>
                <td>4</td>
                <td>榻榻米</td>
                <td>60</td>
                <td>3</td>
                <td>180</td>
            </tr>
        </tbody>
        <tfoot>
            <tr>
                <td>总计</td>
                <th colspan="4" align="right"> $1314 </th>
            </tr>
        </tfoot>


        <table>
</body>

</html>

问题描述：老师您好，当我把thead,tbody,tfood三个标签去掉之后，网页显示并没有变化，请问一下这三个标签具体作用是什么？

Star3327752 2022-03-03

源自：HTML入门 6-10 表格结构