Hey, appreciate the fix! 😃 I see that my initial method of using a while(isElement) loop is starting to show its age.
After taking my time to look at your PR I realise it's going to be a challenge to refactor it to reduce bundlesize further. Without compromising on scenarios like an iframe parent that's also a scroll target, as you've solved in the getRect function. I wish we didn't need to have extra logic to support iframes, and instead keep bundlesize minimal, but I guess our hands are tied 😨
I'll be doing some maintenance on master and return to this PR and get it released later 🙂
Thanks for the contribution, stellar work! 🥇