Scroll-Triggered SVG Animations
An SVG animation can trigger when scrolled into view using Intersection Observer, or link continuously to scroll position itself.
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Triggering an Animation on Scroll Into View
Using the Intersection Observer API to detect when an SVG element enters the viewport, then starting a CSS or JavaScript animation at that moment, is the standard technique for a one-time reveal animation, such as a draw-on line effect that plays once as a user scrolls down to that section.
- Intersection Observer detects when an SVG element enters the viewport
- Starting an animation at that moment is standard for a one-time reveal effect
- Well suited to effects like a draw-on line animation playing once per section
Linking Animation Progress Directly to Scroll Position
For an animation that should progress continuously as a user scrolls rather than playing once, the CSS scroll-driven animations feature or a JavaScript library can bind an SVG's animation progress directly to scroll position, producing an effect where the animation scrubs forward and backward as scrolling changes direction.
- CSS scroll-driven animations or a JavaScript library can bind progress to scroll
- Produces an animation that scrubs forward and backward with scroll direction
- Different from a one-time trigger, since this ties progress continuously to scroll
Frequently Asked Questions
What's the difference between a scroll-triggered and a scroll-linked animation?
A scroll-triggered animation starts once when an element enters the viewport and plays independently, while a scroll-linked animation's progress ties continuously to the scroll position itself.
Does Intersection Observer work well for triggering a one-time SVG reveal?
Yes, it's the standard, performant technique for detecting when an element enters the viewport and starting a one-time animation like a draw-on reveal at that moment.
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