CSS Scroll-Driven Animations: Interactive Progress Timeline
Prompt
Create an interactive timeline that visually represents progress through content sections. Each timeline marker should highlight as the user scrolls through corresponding sections, with smooth animations driven entirely by CSS scroll-driven animations. The timeline should be fixed to the side of the viewport and update in real-time as the user scrolls.
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This interactive timeline demonstrates the power of CSS scroll-driven animations, a modern CSS feature that allows animations to be controlled by the scroll position of a container. Each timeline marker activates as you scroll through its corresponding content section, with smooth animations that are entirely driven by CSS without JavaScript.
The implementation uses animation-timeline: view() and animation-range properties to link animations to the viewport's scroll position. Markers scale up and change color when their associated sections are in view, while content sections fade in as they enter the viewport.
This approach provides a performant, native alternative to JavaScript-based scroll animations, with better browser optimization and smoother performance. The timeline also includes click functionality for navigation and updates the URL hash for better user experience.
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