Percentage rootMargin resolution is unclear
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flackr commented
Section 2.2 says that percentages in rootMargin are resolved relative to the width of the undilated rectangle - however it seems that percentages on the top and bottom rootMargin values are indeed resolved relative to the height as in this demo where the intersection rectangle ends at 10% of the height of the scroller.
I couldn't find any other section about how percentages are resolved so I initially was expecting even the top/bottom percentages to resolve against the width.
szager-chromium commented
This sounds like a chromium bug, not a spec issue. I filed a chromium bug:
https://bugs.chromium.org/p/chromium/issues/detail?id=1138031