An Introduction To CSS Scroll-Driven Animations: Scroll And View Progress Timelines - Smashing Magazine
Briefly

"After five years in development, we are beginning to see scroll-driven animations pop up on websites, allowing for smooth, GPU-accelerated experiences built purely in CSS."
"The introduction of scroll progress timelines links an animation's timeline directly to the scroll position of a scroll container, creating a seamless interaction between scrolling and animation."
Read at Smashing Magazine
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