In the late '90s, the time frame this thread is about, it was well known that the layout engines at the time were not dynamic: they could not in general reflow only parts of the page. Everything else I mentioned in the post that triggered this subthread is obvious simply based on browser engine and OS history.
I don't even know what we're arguing about anymore. Do you dispute this?
> (Netscape 4/Opera/IE) didn't have a JIT, didn't use hardware accelerated layers, trapped into kernel mode for GDI calls, didn't use accelerated SIMD for painting, and didn't have HTTP 2. It barely had any optimizations for dynamic restyling, so tons of stuff would get reflowed when it didn't have to.
In the late '90s, the time frame this thread is about, it was well known that the layout engines at the time were not dynamic: they could not in general reflow only parts of the page. Everything else I mentioned in the post that triggered this subthread is obvious simply based on browser engine and OS history.