A.A. Milne’s Winnie-the-Pooh: “If you live to be a hundred, I want to live to be a hundred minus one day so I never have to live without you.”
A.A. Milne

@scroll-timeline

The @scroll-timeline CSS at-rule defines an AnimationTimeline whose time values are determined by scrolling progress within a scroll container and not by minutes or seconds. Once specified, a scroll timeline is associated with a CSS Animation by using the animation-timeline property.
@scroll-timeline css reference