HTML Table Merge not Working

[crt]

What I'm trying to get\[code\]+---------+---------------------------+--------------+| | | |+---------+ | || | | || +-----------------+---------+ || | | | || +-----------------+ | || | | | || +-----------------+ | || | | | |+---------+-----------------+---------+ || | | | |+---------+-----------------+---------+--------------+\[/code\]The HTML\[code\]<table> <tr> <td></td> <td rowspan="2" colspan="2"></td> <td rowspan="6"></td> </tr> <tr> <td rowspan="4"></td> </tr> <tr> <td></td> <td rowspan="3"></td> </tr> <tr> <td></td> </tr> <tr> <td></td> <td></td> <td></td> </tr></table>\[/code\]But This is not working. I'm not able to merge the second column of first row in 2*2 cells. It always becomes \[code\]colspan="2"\[/code\] only. The \[code\]rowspan="2"\[/code\] is not working. I tried making this using HTML table generator sites like http://html-tables.com/ but it doesn't works there too.This is what I'm getting\[code\]+---------+---------------------------+--------------+| | | |+---------+-----------------+---------+ || | | | || +-----------------+ | || | | | || +-----------------+ | || | | | |+---------+-----------------+---------+ || | | | |+---------+-----------------+---------+--------------+\[/code\]What I think is this is not possible in HTML as it is not working anywhere? Is there any way to achieve the result I want? As shown on the drawing.