Border not appearing in IE9 & IE10

I had a similar problem and your solution above worked for me with a slight change. (I used primefaces)

Following code worked

.ui-datatable tbody>tr>td {
    border-top: 1.1px solid; 
}

Following code didn't work

.ui-datatable tbody>tr>td {
    border-top: 1px solid; 
}