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IntersectionObserver is a JavaScript API implementation that detects when DOM elements become visible or invisible within the viewport. The code provides utility functions for calculating bounding rectangles, handling root margins, and determining threshold crossings for intersection detection.
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Summary
IntersectionObserver is a JavaScript API implementation that detects when DOM elements become visible or invisible within the viewport. The code provides utility functions for calculating bounding rectangles, handling root margins, and determining threshold crossings for intersection detection.
Tags
intersection-observer · javascript · dom-api · bounding-rect · web-api · polyfill
Key entities
IntersectionObserver (technology, 0.95) · JavaScript (technology, 0.9) · DOM API (technology, 0.85) · getBoundingClientRect (concept, 0.9) · viewport-intersection (concept, 0.85)
Classification
code · language en · status final
Provenance
claude-haiku-4-5 via @stacklist/be@0.1.0, confidence 0.85, 6 Jul 2026