I’ve wondered…

A panoramic windshield on a 1959 Edsel Corsair...

…why, in the past decade or so, car windows and windshields have started to have opaque black margins, rather than being clear all the way to the edges as they used to be. Is this stylistic or structural? Does anyone have a clue? How would one go about researching the answer to this question? Anyone have any contacts in the auto industry to whom this query could be directed?