本文介绍如何使用HTML中的colspan和rowspan属性来实现复杂的表格布局效果。通过具体实例展示了单元格如何跨越多列或多行，帮助读者更好地掌握表格排版技巧。
rowspan这两个属性用于创建特殊的表格。
colspan是“column span（跨列）”的缩写。colspan属性用在td标签中，用来指定单元格横向跨越的列数：
在浏览器中将显示如下：
| 单元格1 | ||
| 单元格2 | 单元格3 | 单元格4 |
该例通过把colspan设为“3”, 令所在单元格横跨了三列。如果我们将colspan设为“2”，则该单元格将只跨越两列，于是有必要在第一行插入另外一个单元格，以确保两行占据相同的列数。
该例在浏览器中将显示如下：
| 单元格1 | 单元格2 | |
| 单元格3 | 单元格4 | 单元格5 |
rowspan的作用是指定单元格纵向跨越的行数。
| 单元格1 | 单元格2 |
| 单元格3 | |
| 单元格4 |
上例中的单元格1，其rowspan被设为“3”，这表示该单元格必须跨越三行（本身一行，加上另外两行）。因此，单元格1和单元格2在同一行，而单元格3和单元格4形成独立的两行。
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综合实例
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<html>
<head>
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<wbr><wbr><wbr><wbr></tr><br><wbr><wbr><wbr><wbr><tr><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><td <wbr><wbr>width= "25% "> </td> <wbr><wbr><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><td <wbr><wbr>width= "25% "> </td> <wbr><wbr><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><td <wbr><wbr>width= "25% "> </td> <wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr></tr><br> </table></wbr></wbr></wbr></wbr>
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