```html
<table border="1">
  <tr>
    <th scope="col" colspan="1">Header</th>
    <th scope="col" colspan="2" >Header</th>
    <th scope="col" colspan="1">Header</th>
  </tr>
  <tr>

    <td colspan="2">Col 3</td>
    <td  colspan="1">Col 1</td>
    <td  colspan="1">Col 2</td>
  </tr>
</table>
```

From the above code i need to share first td with two th cells. how it is possible to share the first td cell to share with th if td colspan is greater than th colspan. I got error in first td cell only while sharing with two th headers?