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I would add the ResizeObserver to the list of legit APIs too. It solves a common problem that happen with some complex layouts, and it's very easy to use (and widely supported!).

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IntersectionObserver is something I've come to rely on - allows me to start/stop canvas element animations so they only play when the canvas is visible in the viewport - https://developer.mozilla.org/en-US/docs/Web/API/Intersectio...

Also Mutation Observer, it's great.

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