Intersection Observer API vs Scroll Events

What are the main differences between the Intersection Observer API and scroll events?

The Intersection Observer API allows you to asynchronously observe changes in the intersection of a target element with an ancestor element or with a top-level document's viewport. In contrast, scroll events are triggered whenever the user scrolls, which can lead to performance issues if not handled properly.

Which one is more efficient for tracking visibility of elements?

The Intersection Observer API is generally more efficient because it batches notifications and doesn't require continuous event firing like scroll events do. This reduces the number of calculations and improves performance.

Can I use both together in a project?

Yes, you can use both together. For example, you might use scroll events for certain interactions while leveraging the Intersection Observer API for lazy loading images or triggering animations when elements come into view.

Are there any browser compatibility issues I should be aware of?

The Intersection Observer API is well-supported in modern browsers, but you should check compatibility for older browsers. If you need to support them, consider using a polyfill.