The bathroom floor is prepped for tile using cement backer board. The flange for the toilet is clearly visible along with the water source plumbing for the toilet. Also, the water source and drainage for the bathroom vanity cabinet and sink is present sticking out from the wall.
With the floor tile prep work is done, the bathroom flooring tile is ready to be installed. The seams and screw holes in the backerboard are clearly present in this picture. These voids will be filled with the adhesives used on the backsides of the tiles.