(1) the browser is an application platform so devs are users as well, (2) making it harder to develop good UX by not following the spec _does_ make the experien

(1) the browser is an application platform so devs are users as well, (2) making it harder to develop good UX by not following the spec _does_ make the experience worse for end users, and (3) "hovering elements and overlays" were just a couple of examples - there are tons of reasons why devs need to reliably know where the boundary of the fucking screen is.