Unexpected behaviour when with HTML Table rowspan -

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i creating dynamic table generator, , during testing, found following generated html gives unexpected layout in browsers (firefox, chrome, ie) 

<table>     <tr>         <td rowspan="2"></td>         <td></td>     </tr>     <tr>         <td rowspan="2"></td>     </tr>     <tr>         <td></td>     </tr> </table>

i expecting 2x3 table, top corner merged left cell in middle row, , and middle row right cell merged bottom right cell instead ended 2x2 grid

side note, if provided height on css or row/cell attribute; doesn't change layout of resulting table.

p/s don't intend use layouts; idiot proof codes unintended effects weird layouts such this

edit:

expected:

|------|-------| |      |       | |      |       | |      |-------| |      |       | |      |       | |------|       | |      |       | |      |       | |------|-------|

result:

|------|-------| |      |       | |      |       | |------|-------| |      |       | |      |       | |------|-------|

edit 2: added css

table {     border: 2px solid #000000;    padding: 10px; } td {     border: 2px solid #ff0000;    height: 100px;    width: 100px;    padding: 10px; } tr {    border: 2px solid #00ff00;    padding: 10px }

i tried:

<table>     <tr>         <td rowspan="2" style="border: 1px solid #ff0000; height:200px"></td>         <td style="border: 1px solid #ff0000; height:100px"></td>     </tr>     <tr>         <td rowspan="2" style="border: 1px solid #ff0000; height:200px"></td>     </tr>     <tr>         <td style="border: 1px solid #ff0000; height:100px"></td>     </tr> </table>


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