Looking for examples of HTML scroll resistance

First off - I'm not looking for scroll jacking I've asked this question to a few friends and they always think I'm looking for scroll jacking.

A few months back I saw a site that allowed you to scroll normally, into an area of the site (an account opening module) and you were now sort of locked into this section. You could scroll away from it, but there was resistance required to break away from the section. When you did, you sort of snapped out of it.

Unfortunately I cannot find this page (don't remember the site) and the best example I can show is this youtube video demonstrating the app Peek. You'll see when a person swipes down at the top of the calendar, there's a bit of resistance. The circle starts to stretch, and once they break the threshold, they snap into a previous part of the page that otherwise wouldn't be accessible without the extra effort in the scroll. The part I'm referring to happens at 1:55

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My question is, has anyone seen this anywhere, or is there a technical term for it? Does anyone know how it's done in code? Trying to show a dev of ours so he can understand it properly.

Cheers in advance!