Tom is a Developer Advocate
Move Ya! Or maybe, don't, if the user prefers-reduced-motion!
The prefers-reduced-motion media query detects whether the user has requested that the system minimize the amount of animation or motion it uses.
Trust is Good, Observation is Better—Intersection Observer v2
Intersection Observer v2 adds the capability to not only observe intersections per se, but to also detect if the intersecting element was visible at the time of intersection.