Reference index / 웹 렌더링·성능·상태
IntersectionObserver
An API that asynchronously observes intersection changes between a target and a scroll container or viewport.
Try the example
When to use it
Scroll inside the card and inspect the real intersection ratio
Caveats and distinctions
Basic intersection observation is not a complete visibility or attention measurement; occlusion and opacity require separate consideration.
Implementation and classification
웹·CSS / 웹 렌더링·성능·상태 / HTML · CSS · JavaScript
Sources and verification status
https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API
Source scope and verification status describe the existing catalog record. Publishing this page does not independently re-verify the latest library version, license, or production behavior.