<!DOCTYPE html>
<html>
<head>
<title>Học HTML tại snvn.net</title>
<meta charset="UTF-8">
</head>
<body>
<table border="1" cellpadding="10" width="50%" >
<tr>
<td>A</td>
<td colspan="2">B</td>
<!-- <td>C</td> dòng này xóa đi-->
</tr>
<tr>
<td>X</td>
<td>1</td>
<td>2</td>
</tr>
<tr>
<td>Y</td>
<td>1</td>
<td>2</td>
</tr>
</table>
</body>
</html>