Zell discusses refactoring the Resize, Mutation, and Intersection Observer APIs for easier usage, demonstrating how to implement callback and event listener patterns, while highlighting available options and methods.

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Demonstrates how to refactor JavaScript's MutationObserver and IntersectionObserver APIs into more user-friendly wrapper functions. The refactored APIs support both callback and event listener patterns, simplify element observation, and provide cleaner methods for disconnecting observers. Includes practical examples and mentions a utility library that implements these improvements.

A Better API for the Intersection and Mutation Observers