横向合并

<table border="1" cellpadding="5" align="center"><caption>表格标题</caption><tr align="center"><th>a</th><th>b</th><th>c</th><th>d</th><th>e</th></tr><tr align="center"><td>a</td><td>b</td><td colspan="3" >c</td></tr><tr align="center"><td>a</td><td>b</td><td colspan="3" >c</td></tr></table>

横向合并如下：

纵向合并

<table border="1" cellpadding="5" align="center"><caption>表格标题</caption><tr align="center"><th>a</th><th>b</th><th>c</th><th>d</th><th>e</th></tr><tr align="center"><td>a</td><td>b</td><td rowspan="3" >c</td><td>a</td><td>b</td></tr><tr align="center"><td>a</td><td>b</td><td>a</td><td>b</td></tr><tr align="center"><td>a</td><td>b</td><td>a</td><td>b</td></tr></table>

纵向合并如下：