Why do people do this? It makes for dreadful UX. Reimplementing scrolling is already a sin; in this case it's even worse. The whole website feels slow, the scro

Why do people do this? It makes for dreadful UX. Reimplementing scrolling is already a sin; in this case it's even worse. The whole website feels slow, the scrolling is confusing and inconsistent. Same thing with floating navbars and other fancy stuff, don't do it if you're unable to make it perfect.