<html>
<body>
<TABLE border="1" ">
<CAPTION><EM>A test table with merged cells</EM></CAPTION>
<TR><TH rowspan="2"><TH colspan="2"> Average
<TH rowspan="2">Red<BR>eyes </TH>
</TR>
<TR>
<TH>height</TH><TH>weight</TH>
</TR>
<TR>
<TD>1.9<TD>0.003<TD>40%</TD>
</TR>
<TR>
<TD>1.7<TD>0.002<TD>43%</TD>
</TR>
</TABLE>
</body>
</html>
Me estoy poniendo la salida con el primer elemento de la cabecera como en blancocabecera de la tabla HTML usando rowspan
A test table with merged cells
/-----------------------------------------\
| | Average | Red |
| |-------------------| eyes |
| | height | weight | |
|-----------------------------------------|
| 1.9 | 0.003 | 40% | |
|-----------------------------------------|
| 1.7 | 0.002 | 43% | |
\-----------------------------------------/
Resultados previstos
A test table with merged cells
/----------------------------- \
| Average | Red |
|-------------------| eyes |
| height | weight | |
|------------------------------|
| 1.9 | 0.003 | 40% |
|------------------------------|
| 1.7 | 0.002 | 43% |
\------------------------------/
Y su pregunta sería ...? –