LayoutTests/imported/w3c/web-platform-tests/intersection-observer/iframe-no-root-expected.txt

PASS Observer with the implicit root; target in a same-origin iframe. 
PASS First rAF. 
PASS document.scrollingElement.scrollTop = 200 
PASS iframe.contentDocument.scrollingElement.scrollTop = 250 
PASS document.scrollingElement.scrollTop = 100