Table Row XHTML tag

Table Row Transitional   Strict
tr tags example tags example
Must be contained in <table>      
Must contain in opening tag   ----------------------   ----------------------
Must not contain in opening tag        
Can contain in opening tag        
Must contain between tags <td> <td>&nbsp;</td> As Transitional  
Can contain between tags <th>
scope
rowspan		   As Transitional
As Transitional
As Transitional		  
Must not contain between tags        
Must not be contained in        
Can be contained in          
The tr element acts as a container for a row of table cells defined with the TH or TD elements. You can set default horizontal and vertical alignment of cell contents for the row.