表格细线：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
table {
100px;
height: 100px;
border: 1px solid red;
border-collapse: collapse;
}
td {
border: 1px solid red;
}
</style>
</head>
<body>
<table cellspacing="0">
<tr>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
</table>
</body>
</html>
效果：
