colspan
HTML colspan Attribute （HTML colspan属性）
The HTML colspan attribute specifies how many columns a table cell should span. This attribute allows a single table cell to span the width of more than one column or cell. It has the same functionality as “merge cell” in Excel. （HTML colspan属性指定表格单元格应跨越的列数。此属性允许单个表格单元格跨越多个列或单元格的宽度。它具有与Excel中的“合并单元格”相同的功能。）
You can use the colspan attribute on the <td> and <th> elements.
When the colspan attribute is used on the <td> tag, it determines the number of standard cells it should span. When used on the <th> tag, the colspan attribute specifies the number of header cells it should span.
Syntax
Syntax （语法）
<tag colspan="value"></tag>
Example of the HTML colspan pan attribute used on the <td> element:
<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
</head>
<body>
<table border="1">
<tr>
<th>Month</th>
<th>Salary</th>
</tr>
<tr>
<td>March</td>
<td>$100</td>
</tr>
<tr>
<td>April</td>
<td>$150</td>
</tr>
<tr>
<td colspan="2">Total: $250</td>
</tr>
</table>
</body>
</html>
Example of the HTML colspan attribute used on the <th> element:
<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
</head>
<body>
<table border="1">
<tr>
<th colspan="2">Month and Date</th>
</tr>
<tr>
<td>January</td>
<td>15</td>
</tr>
<tr>
<td>February</td>
<td>23</td>
</tr>
</table>
</body>
</html>