使用scope属性可以实现标头单元格是HTML中的列，行还是一组列或行的标头-
<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
border: 1px solid black;
}
</style>
</head>
<body>
<h2>Cricketers</h2>
<table style = "width:100%">
<caption>Indian Cricketers</caption>
<th></th>
<th scope = "col">Name</th>
<tr>
<td>1</td>
<td>Sachin Tendulkar</td>
</tr>
<tr>
<td>2</td>
<td>Virat Kohli</td>
</tr>
</table>
</body>
</html>