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Does this work in the same way as React Router, where scroll positions are stored in session storage, or is there another way to implement this? Not that I have anything against using session storage - just curious.

It was a big deal to me when I first discovered that scroll restoration doesn’t work out of the box in SPAs. Like “wow, this breaks a central part of the UX when navigating back” and “why haven’t I seen the UI/UX community complain more about this?”

It uses sessionStorage with history state keys, yes. I think SPAs traditionally didn’t care as much because apps had fewer expectations around saving your place. Less long form content maybe? Who knows. We did without a lot of things for a long time.