CSS Scroll-Driven Animations: Interactive Progress Timeline
Prompt
Create an interactive progress timeline using CSS scroll-driven animations. The timeline should have multiple milestones that animate as the user scrolls, with smooth transitions between states. Each milestone should show detailed information when active, and the progress bar should visually track the scroll position.
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This interactive progress timeline demonstrates the power of CSS Scroll-Driven Animations, a modern CSS feature that allows animations to be controlled by the user's scroll position without JavaScript. The timeline features a smooth progress bar that fills as you scroll, and milestone cards that animate into view with subtle transitions.
The implementation uses animation-timeline: scroll() for the progress bar animation, making it directly tied to the scroll container. Each milestone uses animation-timeline: view() with animation-range to control when they appear during scrolling. The Intersection Observer API enhances the experience by adding active states to milestones as they come into view.
Key features include:
- Smooth progress bar that fills based on scroll position
- Milestone cards that animate into view as you scroll
- Active state highlighting for current milestones
- Responsive design that works on mobile devices
- Pure CSS animations driven by scroll position
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