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IntersectionObserver polyfill implementation provides methods for computing element intersection rectangles, expanding root margins, detecting threshold crossings, and shimming getBoundingClientRect for older browser compatibility. The code handles edge cases for IE11 and includes utility functions for rect computation, empty rect generation, and parent node traversal.
Built for AI agentsACO · 22283 tokens
Summary
IntersectionObserver polyfill implementation provides methods for computing element intersection rectangles, expanding root margins, detecting threshold crossings, and shimming getBoundingClientRect for older browser compatibility. The code handles edge cases for IE11 and includes utility functions for rect computation, empty rect generation, and parent node traversal.
Tags
intersection-observer · javascript · dom · polyfill · bounding-rect · browser-compatibility · web-api
Key entities
IntersectionObserver (technology, 0.98) · JavaScript (technology, 0.95) · getBoundingClientRect (concept, 0.9) · rootMargin (concept, 0.85) · DOM (technology, 0.88) · Internet Explorer 11 (technology, 0.75) · W3C (organization, 0.7)
Classification
code · language en · status final
Provenance
claude-opus-4-6 via @stacklist/mcp-server@2.0.0, confidence 0.85, 6 Jul 2026