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A Few Functional Uses for Intersection Observer to Know When an Element is in View

You might not know this, but JavaScript has stealthily accumulated quite a number of observers in recent times, and Intersection Observer is a part of that arsenal. Observers are objects that spot something in real-time — like birdwatchers going to their favorite place to sit and wait for the birds to come.

Different observers observe different things (not everyone watches hawks).

The very first observer I came to know was the Mutation Observer that looks for changes to the DOM … Read article

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IntersectionObserver comes to Firefox

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