| PASS IntersectionObserver in a single document with explicit root. | |
| PASS First rAF | |
| PASS document.scrollingElement.scrollTop = window.innerHeight. | |
| PASS root.scrollTop = 150 with root scrolled into view. | |
| PASS document.scrollingElement.scrollTop = 0. | |
| PASS root.scrollTop = 0 | |
| PASS root.scrollTop = 150 with root scrolled out of view. | |