I think this is great and can be useful for many UXs, but it needs a fallback so it isn't only reliant on scroll state. I had the page load in the background,

I think this is great and can be useful for many UXs, but it needs a fallback so it isn't only reliant on scroll state. I had the page load in the background, so the video didn't load, and I'm guessing when I brought the tab into focus a position event wasn't fired (or not how the library was expecting it), so I didn't get anything until I refreshed. Yes, it is a bit jittery, and could use improvements, but nothing some lerping of positioning, etc probably can't solve.