It depends on where you get your intrepetation from. Under "Playing field", the plate is described as Home plate shall be made of rubber or other suitable material. It shall be a five-sided figure, 17 inches wide across the edge facing the pitcher’s plate. The sides shall be parallel to the inside lines of the batter’s box and shall be 8 1/2 inches long. The sides of the point facing the catcher shall be 12 inches long.
But under "Dimension Table" in the same section of the book it lists Home Plate as: 17” wide, sides parallel to the batter’s box line
and are 8 ½” long, sides of the point facing the catcher are 12” long. The width of the black edge is ¾”
It doesn't say specifically that the black edge is part of the plate, but you could make that assumption because it's listed in the dimension of it.
Most hardball and softball organizations just list the plate as a two-dimensional object that's 17" wide. Why ASA lists the edge in one area and not in the other is a mystery and confuses the point as to whether the edge is part of the plate or not.
Whether it's possible a pitched ball can only touch the black edge and make no contact with the traditional "plate" will take quite a long experiment to determine.....