Another fun one is scroll-triggered animations, as one would commonly find on an Apple product detail page, as just an example. The problem is that it assumes

Another fun one is scroll-triggered animations, as one would commonly find on an Apple product detail page, as just an example. The problem is that it assumes smooth scrolling input, typically a touchpad or a touch-only device. The experience completely breaks down into wild stuttering when scrolling with friction: mouse-wheel that scrolls with discrete steps or the classic "drag the scollbar" interaction. Even when using smooth scrolling input it sucks, as you carefully need to time/verify your scroll speed as content appears/disappears based on force applied.