I was just thinking after reading this - sure there were some engineering marvels that enabled this, but for the implementation it was just rote work with the sheer manpower Microsoft can muster up. That in itself is just really impressive.<p>Edit: giving it more thought, a Mozilla engineer recently demo&#x27;d an immediate mode rendering engine that him and one other dev wrote in 9 months, with feature parity of modern browsers. So either way - big engineering effort or a couple &#x27;10x developers&#x27; - pretty impressive .