Specify the th, td element of a table and add a black border

Example analysis:

##table,th,td{border:1px solid black;}

Use CSS selectors to add black borders to table elements, th elements, and td elements.

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php(php.cn)</title>
<style>
table,th,td
{
border:1px solid black;
}
</style>
</head>
<body>
<table>
<tr>
<th></th>
<th></th>
</tr>
<tr>
<td>Peter</td>
<td>20</td>
</tr>
<tr>
<td>Griffin</td>
<td>23</td>
</tr>
</table>
</body>
</html>
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