Under Sunni (Hanafi) law, a Muslim widow remarries during the period of “iddat”; the marriage is:

Under Sunni (Hanafi) law a marriage with a woman who is observing iddat is "Fasid" (irregular), not void, because the bar is temporary and ends with the iddat. It is not valid, since the impediment exists when the marriage is made, and it is not batil (void), which is the result under Shia law.